Fork

Fork (pronounced fawrk)

(1) An instrument having two or more tines (popularly called prongs), for holding, lifting, etc., as an implement for handling food or any of various agricultural tools.

(2) Something resembling or suggesting this in form or conceptually.

(3) As tuning fork, instruments used (1) in the tuning of musical instruments and (2) by audiologists and others involved in the study or treatment of hearing.

(4) In machinery, a type of yoke; a pronged part of any device.

(5) A generalized description of the division into branches.

(6) In physical geography and cartography, by abstraction, the point or part at which a thing, as a river or a road, divides into branches; any of the branches into which a thing divides (and used by some as a convention to describe a principal tributary of a river.

(7) In horology, (in a lever escapement) the forked end of the lever engaging with the ruby pin.

(8) In bicycle & motorcycle design, the support of the front wheel axles, having the shape of a two-tined fork.

(9) In archery, the barbed head of an arrow.

(10) To pierce, raise, pitch, dig etc, with a fork.

(11) Metonymically (and analogous with the prongs of a pronged tool), to render something to resemble a fork or describe something using the shape as a metaphor.

(12) In chess, to maneuver so as to place two opponent's pieces under simultaneous attack by the same piece (most associated with moves involving the knight).

(13) In computer programming, to modify a software’s source code to create a version sufficiently different to be considered a separate path of development.

(14) In computer programming, as "fork bomb", a program that creates a large number of self-replicating tasks or processes in a computer system in order to cause a DoS (denial of service).

(15) To turn as indicated at a fork in a road, path etc.

(16) Figuratively, a point in time when a decision is taken.

(17) In fulminology (the scientific (as opposed to the artistic or religious) study of lightning), as "forked lightning", the type of atmospheric discharge of electricity which hits the ground in a bolt.

(18) In software development, content management & data management, figuratively (by abstraction, from a physical fork), a departure from having a single source of truth (SSOT) (unintentionally as originally defined but later also applied where the variation was intentional; metonymically, any of the instances of software, data sets etc, thus created.

(19) In World War II (1939-1945) era British military jargon, the male crotch, used to indicate the genital area as a point of vulnerability in physical assault.

(20) in occupational slang, a clipping of forklift; any of the blades of a forklift (or, in plural, the set of blades), on which the goods to be raised are loaded.

(21) In saddlery, the upper front brow of a saddle bow, connected in the tree by the two saddle bars to the cantle on the other end.

(22) In slang, a gallows (obsolete).

(23) As a transitive verb, a euphemistic for “fuck” one of the variations on f***, ***k etc and used typically to circumvent text-based filters.

(24) In underground, extractive mining, the bottom of a sump into which the water of a mine drains; to bale a shaft dry (still often spelled forcque).

(25) As the variant chork, an eating utensil made with a combination of chopstick & fork, intended for neophyte chopstick users.

(26) In literature, as "silver fork novel" a genre in nineteenth century English literature that depicted the lives of the upper class and the aristocracy (known also as the "fashionable novel" and "drawing room fiction").

Pre-1000: From the Middle English forke (digging fork), from the Old English force & forca (pitchfork, forked instrument, forked weapon; forked instrument used to torture), from the Proto-West Germanic furkō (fork), from the Latin furca (pitchfork, forked stake; gallows, beam, stake, support post, yoke) of uncertain origin. The Middle English was later reinforced by the Anglo-Norman & Old Northern French forque (it was from the Old French forche which French gained fourche), also from the Latin.  It was cognate with the Old Frisian forke, the North Frisian forck (fork), the Dutch vork (fork), the Danish vork (fork) and the German Forke (pitchfork).  The evolved Middle English form displaced the native Old English gafol, ġeafel & ġeafle (fork) (and the apparently regionally specific forcel (pitchfork) though the use from circa 1200 to mean “forked stake or post used as a prop when erecting a gallows” did for a while endure, probably because of the long-life of the architectural plans for a structure which demanded no change or functional improvement.  The alternative spelling forcque is used in mining and describes the "bottom of a sump".  Perhaps surprisingly, dictionaries don't list forkish or forkesque as standard adjectives.  Fork is a noun & verb, forking is a noun, verb, adjective & adverb, forklike is an adjective and forked is a verb & adjective; the noun plural is forks.

Representation of the forks the Linux operating system.  Software forks can extend, die off or merge with other forks.

The forks of The Latin furca (in its primary sense of “fork”) may be from the primitive Indo-European gherk & gherg (fork) although etymologists have never traced any explanation for the addition of the -c-, something which remains mysterious even if the word was influenced by the Proto-Germanic furkaz & firkalaz (stake, stick, pole, post) which was from the primitive Indo-European perg- (pole, post).  If such a link existed, it would relate the word to the Old English forclas pl (bolt), the Old Saxon ferkal (lock, bolt, bar), the Old Norse forkr (pole, staff, stick), the Norwegian fork (stick, bat) and the Swedish fork (pole).  The descendants in other languages include the Sranan Tongo forku, the Dutch vork, the Japanese フォーク (fōku), the Danish korf, the Kannada ಫೋರ್ಕ್ (phōrk), the Korean 포크 (pokeu), the Maori paoka, the Tamil போர்க் (pōrk) and the Telugu ఫోర్క్ (phōrk).  In many languages, the previous form was retained for most purposes while the English fork was adopted in the context of software development.

Forks can be designed for specific applications, this is a sardine fork, the dimensions dictated by the size of the standard sardine tin.

Although visitors from Western Europe discovered the novelty of the table fork in Constantinople as early as the eleventh century, the civilizing influence from Byzantium seems not routinely to have appeared on the tables of the English nobility until the 1400s and the evidence suggests it didn’t come into common use before the early seventeenth century.  The critical moment is said to have come in 1601 when the celebrated traveller and writer Thomas Coryat (or Coryate) (circa 1577–1617) returned to London from one of his tours, bringing with him the then almost unknown "table fork" which he'd seen used in Italy.  This "continental affectation" made him the subject of mirth and playwrights dubbed him "the fork-carrying traveller" while the street was earthier, the nickname "Furcifer" (from the Latin meaning "fork-bearer, rascal") soon adopted and despite the early scepticism, there soon were many types of "specific purpose forks (cake fork, cocktail fork, dessert fork etc).  Mr Coryat thus made one of the great contributions to the niceties of life, his other being the introduction to the  English language of the word "umbrella", another influence from Italy.

Cause and effect: The fork in the road.

In Lewis Carroll’s (1832–1898, the (pen name of Charles Lutwidge Dodgson (1832–1898)) Alice's Adventures in Wonderland (1865), when Alice comes to a fork in the road, she encounters the Cheshire Cat sitting in a tree:

Alice: “Would you tell me, please, which way I ought to go from here?”

Cat: “That depends a good deal on where you want to get to.”

Alice: “I don’t know.”

Cat: “Then it doesn't matter which way you go.”

One can see the cat’s point and a reductionist like Donald Rumsfeld (1932–2021: US defense secretary 1975-1977 & 2001-2006) there would have ended the exchange but the feline proved more helpful, telling Alice she’ll see the Mad Hatter and the March Hare if she goes in certain directions, implying that no matter which path she chooses, she’ll encounter strange characters.  That she did and the book is one of the most enjoyable flights of whimsy in English.

The idiomatic phrase “fork in the road” wasn’t in use early in the seventeenth century when translators were laboring to create the King James Bible (KJV, 1611) so “…the king of Babylon so stood at the parting of the way, at the head of the two ways…” appeared whereas by 1982 when the New King James Version (NKJV, 1982) was released, that term would have been archaic so the translation was rendered as “…the king of Babylon stands at the parting of the road, at the fork of the two roads…”.

Ezekiel 21:19-23; King James Version of the Bible (KJV, 1611):

Also, thou son of man, appoint thee two ways, that the sword of the king of Babylon may come: both twain shall come forth out of one land: and choose thou a place, choose it at the head of the way to the city. Appoint a way, that the sword may come to Rabbath of the Ammonites, and to Judah in Jerusalem the defenced. For the king of Babylon stood at the parting of the way, at the head of the two ways, to use divination: he made his arrows bright, he consulted with images, he looked in the liver. At his right hand was the divination for Jerusalem, to appoint captains, to open the mouth in the slaughter, to lift up the voice with shouting, to appoint battering rams against the gates, to cast a mount, and to build a fort. And it shall be unto them as a false divination in their sight, to them that have sworn oaths: but he will call to remembrance the iniquity, that they may be taken.

Ezekiel 21:19-23; New King James Version of the Bible (NKJV, 1982):

And son of man, appoint for yourself two ways for the sword of the king of Babylon to go; both of them shall go from the same land. Make a sign; put it at the head of the road to the city. Appoint a road for the sword to go to Rabbah of the Ammonites, and to Judah, into fortified Jerusalem. For the king of Babylon stands at the parting of the road, at the fork of the two roads, to use divination: he shakes the arrows, he consults the images, he looks at the liver. In his right hand is the divination for Jerusalem: to set up battering rams, to call for a slaughter, to lift the voice with shouting, to set battering rams against the gates, to heap up a siege mound, and to build a wall. And it will be to them like a false divination in the eyes of those who have sworn oaths with them; but he will bring their iniquity to remembrance, that they may be taken.

The KJV & NKJV closely are related but do in detail differ in the language used, the objective of the latter being to enhance readability while retaining the stylistic beauty and literary structure of the original.  Most obviously, the NKJV abandoned the use of archaic words and convention of grammar (thee, thou, ye, thy, thine, doeth, speaketh etc) which can make it difficult for modern readers to understand, rather as students can struggle with Shakespeare’s text, something not helped by lecturers reminding them of its beauty, a quality which often escapes the young.  The NKJV emerged from a reaction to some of the twentieth century translations which traditionalist readers thought had “descended” too far into everyday language; it was thus a compromise between greater readability and a preservation of the original tone.  Both the KJV & NKJV primarily used the Textus Receptus (received text) for the New Testament and Masoretic Text for the Old Testament and this approach differed from other modern translations (such as the New International Version (NIV, 1978) & English Standard Version (ESV, which 2001) used a wider sub-set of manuscripts, including older ones like the Alexandrian texts (Codex Vaticanus, Sinaiticus etc)  So, the NKJV is more “traditional” than modern translations but not as old-fashioned as the KJV and helpfully, unlike the KJV which provided hardly any footnotes about textual variants, the NKJV was generous, showing where differences existed between the major manuscript traditions (Textus Receptus, Alexandrian & Byzantine), a welcome layer of transparency but importantly, both used a formal equivalence (word-for-word) approach which put a premium on direct translation over paraphrasing, the latter technique much criticized in the later translations.

Historians of food note word seems first to have appeared in this context of eating utensils in an inventory of household goods from 1430 and they suggest, because their influence in culinary matters was strongest, it was probably from the Old North French forque.  It came to be applied to rivers from 1753 and of roads by 1839.  The use in bicycle design began in 1871 and this was adopted directly within twenty years when the first motorcycles appeared.  The chess move was first so-described in the 1650s while the old slang, forks "the two forefingers" was from 1812 and endures to this day as “the fork”.  In the world of cryptocurrencies, fork has been adopted with fetish-like enthusiasm to refer to (1) a split in the blockchain resulting from protocol disagreements, or (2) a branch of the blockchain resulting from such a split.

Lindsay Lohan with Tiramisu and cake-fork, Terry Richardson (b 1965) photoshoot, 2012.

The verb dates from the early fourteenth century in the sense of (1) “to divide in branches, go separate ways" & (2) "disagree, be inconsistent", both derived from the noun.  The transitive meaning "raise or pitch with a fork" is from 1812, used most frequently in the forms forked & forking while the slang verb phrase “fork (something) over” is from 1839 while “fork out” (give over) is from 1831).  The now obsolete legal slang “forking” in the forensic sense of a "disagreement among witnesses" dates from the turn of the fifteenth century.  The noun forkful was an agricultural term from the 1640s while the specialized fourchette (in reference to anatomical structures, from French fourchette (diminutive of fourche (a fork)) was from 1754.  The noun pitchfork (fork for lifting and pitching hay etc.) described the long-used implement constructed commonly with a long handle and two or three prongs first in the mid fourteenth century, altered (by the influence of pichen (to throw, thrust), from the early thirteenth century Middle English pic-forken, from pik (source of pike).  The verb use meaning "to lift or throw with a pitchfork," is noted from 1837.  The spork, an eating utensil which was fashioned by making several long indents in the bowl to create prongs debuted in 1909.

Dining room of Huis Doorn.

Huis Doorn (Doorn House) near Utrecht in the Netherlands, was the country house in which the exiled Kaiser Wilhelm II (1859–1941; Emperor of Germany & King of Prussia 1888-1918) would live until his death.  Confiscated by the state at the end of World War II (1939-1945), Huis Doorn is now a museum, maintained much as the former Kaiser left it.  At his place on the dining room table sits one of his special forks with three tines, the widened one to the left a blade serving as a knife because a congenitally withered left-arm made the use of a conventional utensil too difficult.

Compelled by circumstances to abdicate at the end of World War I (1914-1918) Wilhelm was granted asylum by the neutral Netherlands, the cabinet insisting his status would be that of a private German citizen; to the status-conscious former Kaiser, it remained for the rest of his life a disappointment that Wilhelmina (1880–1962; Queen of the Netherlands 1890-1948) would neither receive nor visit him.  He’d arrived in the Netherlands accompanied by a reputed 64 train carriages of imperial household goods (furnishings, art, bibelots and such) and an unknown slice of the German exchequer so was able to purchase and adequately decorate Huis Doorn which he purchased, taking up residence in May 1920.  However much of the Imperial Treasury came with him remains a matter of speculation but until his death, he maintained a household staff sufficient to ensure “a certain grandeur”.  Hermann Göring (1893–1946; leading Nazi 1922-1945, Hitler's designated successor & Reichsmarschall 1940-1945) did on several occasions pay a visit but that stopped as soon as the Nazis took power in Germany in 1933; the former sovereign had out-lived any potential usefulness to the party.  Indeed, Adolf Hitler (1889-1945; Führer (leader) and German head of government 1933-1945 & head of state 1934-1945) would have preferred if the old man had had the decency quietly to drop dead because the last thing he wanted was any possibility the monarchy might be restored.  He regarded Benito Mussolini’s (1883-1945; Duce (leader) & Prime-Minister of Italy 1922-1943) greatest mistake (and there were a few) as having not deposed the Victor Emmanuel III (1869–1947; King of Italy 1900-1946) when he had the chance and to his dying day suspected a conspiracy between the Freemasons and the royal court was behind the Duce’s downfall in 1943.  There may be something in that because Marshal Pietro Badoglio (1871–1956; Prime Minister of Italy 1943-1944), appointed by the King as Mussolini’s replacement, was a confessed Freemason.

Speciale vork voor Willem II: One of Wilhelm's silver Kaisergabels (Imperial fork).

In a coda which would have amused those who remembered Winston Churchill’s (1875-1965; UK prime-minister 1940-1945 & 1951-1955) glee at hearing the chant “Hang the Kaiser!” at the end of World War I, after the Netherlands was invaded in 1940, fearing the Nazis might murder their former ruler, through diplomatic channels he offered to receive Wilhelm “with dignity and consideration” if he chose to seek refuge in the UK.  The offer was declined and he remained safely in Huis Doon until his death, the Nazis simply ignoring him because in the euphoria of victory, there was in Germany no longer a significant pro-monarchist movement.  Churchill's offer has been treated by some historians as “a humanitarian gesture” but he always had a fondness for monarchical government (his wife called him “the last man in Europe still to believe in the divine right of kings”) and it's suspected he may have pondered the idea of a restoration (possibly Crown Prince Wilhelm (1882–1951)) in constitutional form.

Der Gableschwanz Teufl: The Lockheed P-38 Lightning (1939-1945).  During World War II, the Luftwaffe’s (German air force) military slang for the twin-boomed Lockheed P-38 Lightning was Der Gableschwanz Teufl (the fork-tailed devil).

Novelty nail-art by US restaurant chain Denny's.  The manicure uses as a base a clean, white coat of lacquer, to which was added miniature plastic utensils, the index finger a fork, the middle finger a knife, the ring finger a spoon, and the pinky finger presumably a toothpick or it could be something more kinky.

The idiomatic “speak with forked tongue” to indicate duplicitous speech dates from 1885 and was an invention of US English though reputedly influenced by phrases settlers learned in their interactions with first nations peoples (then called “Red Indians”).  The earlier “double tongue” (a la “two-faced”) in the same sense was from the fifteenth century.  Fork as a clipping of the already truncated fork-lift (1953) fom the fork-lift truck (1946), appears to have enter the vernacular circa 1994.  The adjective forked (branched or divided in two parts) was the past-participle adjective from the verb and came into use early in the fourteenth century.  It was applied to roads in the 1520s and more generally within thirty years while the use in the sixteenth and seventeenth century with a suggestion of "cuckold" (on the notion of "horned") is long obsolete.    Applied in many contexts (literally & figuratively), inventions (with and without hyphens) include fork-bomb, fork-buffet, fork-dinner, fork-head, rolling-fork, fork-over, fork-off & fork-up (the latter pair euphemistic substitutions for "fuck off" & "fuck-up).

Führerspork: Spork (left) from a flatware set (right) made for Adolf Hitler's 50^th birthday, sold at auction in 2018 for £12,500.  The items had been discovered in England in a house once owned by a senior military officer, the assumption being they were looted in 1945 (“souveniring” or “spoils of war” in soldiers' parlance), the items all bearing the Nazi eagle, swastika and Hitler's initials.  Auction houses can be inconsistent in their descriptions of sporks and in some cases they're listed as splayds, the designs meaning sometimes it's a fine distinction.

1979 Benelli 750 Sei (left) and Benelli factory schematic of the 750 Sei’s fork (series 2a, right).

One quirk in the use of the word is the tendency of motorcyclists to refer to the front fork as “the forks”.  Used on almost every motorcycle made, the fork is an assembly which connects the front axle (and thus the wheel) to the frame, usually by via a pair (upper & lower) of yokes; the fork provides both the front suspension (springs or hydraulics) and makes possible the steering.  The reason the apparatus is often called “the forks” is the two most obvious components (the left & right) tubes appear to be separate when really they are two prongs connected at the top.  Thus, a motor cycle manufacturer describes the assembly (made of many components (clamp, tubes, legs, springs, dampers etc)) “a fork” but, because of the appearance, riders often think of them as a pair of forks, thus the vernacular “the forks”.  English does have other examples of such apparent aberrations such as a “pair of spectacles” which is sold as a single item but the origin of eye-glasses was in products sold as separate lens and users would (according to need) buy one glass (what became the monocle) or a pair of glasses.  That is a different structural creation than the bra which on the model of a “pair of glasses” would be a “pair of something” but the word is a clipping of “brassiere”.  English borrowed brassiere from the French brassière, from the Old French braciere (which was originally a lining fitted inside armor which protected the arm, only later becoming a garment), from the Old French brace (arm) although by then it described a chemise (a kind of undershirt) but in the US, brassiere was used from 1893 when the first bras were advertised and from there, use spread.  The three syllables were just too much to survive the onslaught of modernity and the truncated “bra” soon prevailed, being the standard form throughout the English-speaking world by the early 1930s.  Curiously, in French, a bra is a soutien-gorge which translates literally and rather un-romantically as “throat-supporter” although “chest uplifter” is a better translation.

2004 Dodge Tomahawk.

There have been variations on the classic fork and even designs which don’t use a conventional front fork, most of which have been variations on the “swinging arm” a structure which is either is or tends towards the horizontal.  One of the most memorable to use swinging arms was the 2004 Dodge Tomahawk, a “motorcycle” constructed around a 506 cubic inch (8.3 litre) version of the V10s used in the Dodge Viper (1991-2010 & 2013-2017) and the concept demonstrated what imaginative engineers can do if given time, money, resources and a disconnection from reality.  Designing a 500 horsepower (370 kW) motorcycle obviously takes some thought so what they did to equalize things a bit in what would otherwise be an unequal battle with physics was use four independently sprung wheels which allowed the machine to corner with a lean (up to 45^o said to be possible) although no photographs seem to exist of an intrepid rider putting this projection to the test.  Rather than a fork, swinging arms were used and while this presumably enhanced high-speed stability, it also meant the turning circle was something like that of one of the smaller aircraft carriers.  There were suggestions a top speed of some 420 mph (675 km/h) was at least theoretically possible although a sense of reality did briefly intrude and this was later revised to 250 mph (400 km/h).  In the Dodge design office, presumably it was thought safe to speculate because of the improbability of finding anyone both sufficient competent and crazy enough to explore the limits; one would find plenty of either but the characteristics rarely co-exist.  Remarkably, as many as ten replicas were sold at a reputed US$555,000 and although (mindful of the country’s litigious habits) all were non-operative and described as “art deco inspired automotive sculpture” to be admired as static displays, some apparently have been converted to full functionality although there have been no reports of top speed testing.

Britney Spears (b 1981): "Video clip with fork feature", Instagram, 11 May 2025.

Unfortunately, quickly Ms Spears deleted the more revealing version of the clip but for those pondering the messaging, Spearologists (a thoughtful crew devoted to their discipline) deconstructed the content, noting it came some days after she revealed it had been four months she’d left her house.  The silky, strapless dress and sweat-soaked, convulsing flesh were (by her standards) uncontroversial but what may have mystified non-devotees was the fork she at times held in her grasp.  Apparently, the fork was an allusion to her earlier quote: “Shit!  Now I have to find my FORK!!!”, made during what was reported as a “manic meltdown” (itself interesting in that it at least suggests the existence of “non-manic” meltdowns) at a restaurant, following the abrupt departure of her former husband (2022-2024) Hesam "Sam" Asghari (b 1994).  The link between restaurant and video clip was reports Mr Asghari was soon to be interviewed and there would be questions about the marriage.  One of her earlier posts had included a fork stabbing a lipstick (forks smeared with lipstick a trick also used in Halloween costuming to emulate facial scratches) and the utensil in the clip was said to be “a symbol of her frustration and emotional state.”  Now we know.

Großadmiral (Grand Admiral, equivalent to an admiral of the fleet (Royal Navy) or five star (fleet) admiral (US Navy)) Alfred von Tirpitz (1849–1930; State Secretary of the German Imperial Naval Office 1897-1916).

He's remembered now for (1) his role in building up the Imperial German Navy, triggering events which would play some part in the coming of World War I, (2) his distinctive twin-forked beard and (3) being the namesake for the Bismarck class battleship Tirpitz (1939-1944) which, although she hardly ever took to the high seas and fired barely a shot in anger, merely by being moored in Norwegian fjords, she compelled the British Admiralty to watch her with a mix of awe and dread, necessitating keeping in home waters a number of warships badly needed elsewhere.  Such was the threat his namesake battleship represented, just the mistaken belief she was steaming into the path of a convoy (PQ 17, June 1942) of merchant ships bound for the Russian port of Archangel caused the Admiralty to issue a “scatter order” (ie disperse the convoy from the escorting warships), resulting in heavy losses.  After a number of attempts, in 1944, she finally was sunk in a raid by RAF (Royal Air Force) bombers but, because some of the capsized hull remained visible above the surface, some wags in the navy insisted the air force had not "sunk the beast" but merely "lowered her to the waterline".  It wasn't until after the war the British learned the RAF's successful mission, strategically, had been unnecessary, earlier attacks (including the Admiralty's using mines placed by crews in midget submarines) having inflicted so much damage there was by 1944 no prospect of the Tirpitz again venturing far from her moorings.

Lieutenant General Nagaoka Gaishi san, Tokyo, 1920.

When Großadmiral von Tirpitz died in 1930, he and twin-fork beard were, in the one casket, buried in Bavaria's Münchner Waldfriedhof “woodland cemetery”.  The “one body = one casket” protocol is of course the almost universal practice but there have been exceptions and one was Lieutenant General Gaishi Nagaoka (1858-1933) who served in the Imperial Japanese Army between 1978-1908, including as vice chief of the general staff during the Russo-Japanese War (1904-1905).  While serving as a military instructor, one of his students was the future Generalissimo Chiang Kai-shek (1887-1975; leader of the Republic of China (mainland) 1928-1949 & the renegade province of Taiwan 1949-1975).  After retiring from the military, he entered politics, elected in 1924 as a member of the House of Representatives (after Japan in the 1850s ended its “isolation” policy, it’s political and social system were a mix of Japanese, British and US influences).  After he died in 1933, by explicit request, his impressive “handlebar” moustache carefully was removed and buried in a separate casket in Aoyama Cemetery.

Equiluminant

Equiluminant (pronounced ee-kwuh-loom-uh-nuhnt)

(1) In optics, the quality of two or more objects or phenomenon being equally luminant.

(2) Figuratively, two or more people being judged equally illustrious, attractive, talented etc.

1860s: The construct was equi- +‎ luminant.  As an adjective, luminant means "that which illuminates; that which is luminous" while as a noun it describes "an illuminating agent".  Luminant was from the Latin verb lūminant, the third-person plural present active indicative of lūminō, the construct being lūmen, from the Proto-Italic louksmən, from the primitive Indo-European léwk-s-mn̥, from the root lewk- (bright) +‎ -ō (appended to form agent nouns).  The accepted synonym is isoluminant and equiluminescent is the alternative form.  When used figuratively, although it would make no sense in science, the comparative is “more equiluminant” and the superlative most “equiluminant”.  Equiluminant & equiluminescent are adjectives and equiluminance is a noun; the noun plural is equiluminances (which some list as non-standard).

The prefixes: equi-, homo-, peri- & iso-

The prefixes “equi-”, “homo-”, “peri-” & “iso-” are all used to in same way suggest a concept of sameness or equality, but by tradition and convention, are used in different contexts to produce different meanings or emphasis:  Equi- is used to indicate equality, evenness, or uniformity and is often seen in mathematical, scientific & technical publications to describe something is equal in measure or evenly distributed such as equilateral (a shape having all sides of equal length, equidistant (being at equal distances from two or more points) & equilibrium (a state of balance where opposing forces or influences are equal).  Homo- is used to imply “same” or “alike” and thus sameness or (sometimes by degree) similarity.  In technical use it is a standard form in biology, chemistry & the social sciences to indicate sameness in kind, structure, or composition and by far the most common modern use is in the now familiar “homosexual” which in many jurisdictions is now a proscribed (or at least discouraged) term because of negative associations (“homo” as a stand-alone word also having evolved as a slur used of, about or against homosexual men).

The uses of the prefix are illustrated by homogeneous (composed of parts or elements that are all of the same kind, homologous (having the same relation, relative position, or structure) & homonym (in linguistics words which sound the same or are spelled the same but have different meanings).  Iso- is used to denote equality, uniformity, or constancy in terms of specific characteristics like size, number, or configuration and is most used in scientific and mathematical publications.  Examples of use include isometric (having equal dimensions or measurements, isothermal (having constant temperature) & isosceles (having two sides of equal length).  Peri- is used to denote “surrounding or enclosing”, or “something near or around a specific area or object”, examples including perimeter (the continuous line forming the boundary of a closed geometric figure), periscope (an optical instrument for viewing objects that are above the level of direct sight, using mirrors or prisms to reflect the view & peripheral (relating to or situated on the edge or periphery of something.  So equi-focuses on equality in measure, distance, or value, homo- focuses on sameness in kind, structure, or composition, iso- focuses on equality or uniformity in specific characteristics or conditions while peri- :focuses on surrounding or enclosing, or being near or around something.  For most purposes equi- & iso- can be used interchangeably and which is used tends to be a function of tradition & convention.

Equiluminant colors

An example the equiluminant in blue & orange.  In color the text appears at the edges to "shimmer" or "vibrate".  When re-rendered in grayscale, because the value of the luminance is so close, the two shades become almost indistinguishable.

In optics, “equiluminant” is a technical term used to colors with the same (or very similar) luminance (brightness) but which differ in hue (color) or saturation (intensity).  The standard test for the quality is to convert a two-color image to grayscale and, if equiluminant, the colors would appear nearly indistinguishable because they share the same level of “lightness”.  It’s of some importance in fields as diverse as military camouflage, interior decorating, fashion, astronomy and cognitive psychology.  In the study of visual perception, when colors are equiluminant, the human visual system relies primarily on the differences in hue and saturation (rather than brightness) to distinguish between them and this can create challenges in perception; in many cases, the brain will struggle to segregate colors based solely on luminance; essentially, there is a lack of information.

An enigmatic abstraction (2024) by an unknown creator.  This is an example of the use of non-equiluminant shades of orange & blue, the original to the left, copy rendered in gray-scale to the right.

In art and design, the quality of equiluminance can be exploited to create visual effects, the perception of some “shimmering” or “vibrating” at the edges where colors meet actually a product of the way the different hues are perceived by the brain to be “less defined” (a process not dissimilar to the “grayscaling”) and thus “dynamic”, lending the impression of movement even in a static image, especially if seen with one’s peripheral vision.  While a handy device for visual artists, it can be something of some significance because the close conjunction of equiluminant colors can make certain visual tasks more difficult, most obviously reading text or distinguishing shapes and objects.  All that happens is the extent of the luminance contrast can create a perception of fuzziness at the edges of shapes which means some people can suffer a diminished ability to distinguish fine details and the smaller the object (text, numerals or geometric shape), the more acute the problem.  The phenomenon has been well researched, scientists using the properties in equiluminant colors to study how the brain processes color and the findings have been important in fields like instrumentation and the production of warning signs.

Richard Petty's 1974 NASCAR (National Association of Stock Car Auto Racing) Dodge Charger (left) and 3 ton Super-Duty Jack, produced under licence by the Northern Tool Company (right).

1974 was the last year in which the big-block engines were allowed to run in NASCAR and the big-block era (1962-1973) was NASCAR's golden age.  Richard Petty (b 1937) used a "reddish orange" to augment his traditional blue when he switched from Plymouth to Dodge as the supplier of his NASCAR stockers in the early 1970s.  His team was actually sponsored by STP rather than Gulf and STP wanted their corporate red to be used but in the end a "reddish orange" compromise was negotiated.  However, when he licenced the Northern Tool Company to sell a "Richard Petty" jack, the shade used appeared to be closer to the classic "Gulf orange".

Sexy Lamborghinis in a not quite equiluminant color combination following those of the Gulf Western racing teams: 1964 1C TL tractor (top) and 1968 1R tractor (bottom).

Lamborghini had been making tractors and other farm equipment since 1948 when first its track-drive models appeared in 1955, the 1C-TL produced between 1962-1966.  Unrelated to that model cycle, it was in 1966 Lamborghini unveiled the sensational Miura (1966-1973), powered by a transversely located, mid-mounted, 3,929 cm³ (240 cubic inch) V12 engine which sucked prodigious quantities of gas (petrol) through four triple throat downdraft Weber carburetors, each of which was needed to satiate the thirst.  The power was sent to the road via a five-speed transaxle which shared it's lubrication with the engine (shades of the BMC Mini (1959-2000) which turned out to be a bad idea and one not corrected until the final run as the Miura SV (1971-1973).  To achieve the stunning lines, mounting the V12 transversely was the only way to make things fit and the engineering was a masterpiece of packaging efficiency but it resulted in the car displaying some curious characteristics at high speed.  The specification of the 1C TL Tractor was more modest although quite appropriate for its purpose; it was powered by an air-cooled 1,462 cm³ (89 cubic inch) which delivered power to the rear portal axle and drive sprockets via a dual-range, three-speed manual transmission.  However, being a diesel, there was of course fuel-injection (by Bosch), an advance Lamborghini's V12s didn’t receive until 1985 when US emission-control regulations compelled the change.  This version of 1R tractor is known as the cofano squadrato (squared hood (bonnet)); produced between 1966-1969, it replaced the earlier 1R (1961-1965) which featured a rounded hood.  The earlier model seems not retrospectively to have been christened but presumably it would have been the cofano arrotondato (rounded hood), proving everything sounds better in Italian.  An Italian could read from a lawnmower repair manual and it would sound poetic.

As everybody knows, in Mean Girls (2004), there's an example or reference point for just about every known sociological, zoological, linguistic, political, scientific, botanical, geological or cosmological phenomenon yet observed.  Here, Lindsay Lohan in baby pink and powder blue illustrates an instance of equiluminance.

At scale, equiluminance doesn’t have to be obvious for it still to have desirable “side effects” and while it’s often noted two specific hues ((1) the blue Llewellyn Rylands pigments 3707 (Zenith Blue, replicated by Dulux as “Powder Blue”) & (2) the orange Rylands pigments 3957 (Tangerine, replicated by Dulux as “Marigold”)), that their use in combination appears so often on cars, motor-cycles and other stuff with wheels is due less to the claim the shades seem at the edge to “vibrate” that the striking combination appearing on some of the Gulf Oil sponsored Ford GT40s and Porsche 917s during sports car racing’s golden era (1950-1972).  Given the surface area involved, the effect is probably imperceptible when viewed at close range but the science does suggest that at speed (and these were fast machines), at the typical viewing range found on racetracks, there was what the optical analysts call “visual pop”, something which heightens the brain’s perception of motion.

Ford GT40 chassis# 1075, winner of the 1968 & 1969 Mans 24 hour endurance classic in Gulf racing livery.

Gulf's colors were not equiluminescent.  The company's original "corporate color scheme" had been a dark blue & orange combo but Gulf was an acquisitive conglomerate and in late 1967 it took over the Wilshire Oil Company of California, the signature colors of which were powder blue and orange, something which Gulf’s management thought “more exciting” and better suited to a racing car.  The change was made for the 1968 season with the Fords now running as five-litre (305 cubic inch) sports cars, governing body having banned the seven-litre engines the cars previously had used (under a variety of names, motorsport has for decades been governed by some of world sport’s dopiest regulatory bodies).  In the Gulf colors, fitted with 302 cubic inch (4.9 litre) engines, Ford GT40 Mark I (chassis #1075) won the Le Mans 24 hour endurance classic in 1968 & 1969 (repeating the brace Ford had achieved with the 7.0 litre (427 cubic inch) Mark II & Mark IV versions in 1966-1967), the first time the same car had achieved victory twice.  In 1968, #1075 won the BOAC International 500, the Spa 1000-kilometer race, and the Watkins Glen 6-hour endurance race, while in 1969 it also took the Sebring 12-hour race, a remarkable achievement for a race car thought obsolescent.  The livery has since been much replicated, including on many machines which have never been near a race track.

1971 Porsche 917K in Gulf Racing livery.  The fins were added to improve straight-line stability and were strikingly similar to those which appeared on some late 1950s US Chryslers although the aerodynamic properties of those were dubious, despite corporate claims.

Interestingly, the team painting the GT40s were aware of the issue created by equiluminant colors and knew that when photographed in certain conditions, the shades could tend thus.  As a matter of professional pride, they didn’t want it thought they’d created something with “fuzzy edges” so deliberately was added a dark blue hairline-border around the orange, reducing the optical illusion to ensure that when photographed, everything looked painted with precision.  When the Gulf team in 1970 switched to using Porsche 917s for the World Sports Car championship, they adopted the expedient of a black line of definition between the blue & orange so the whole enduring appeal of the combination lies just in the striking contrast and relies not at all on any tendency to the equiluminant.

Ford GT Heritage Edition First Generation (left) and Second Generation (right). 

Little more than 100 GT40s were built but Ford noted with interest the ongoing buoyancy of the replica market, as many as 2,000 thought to have been built in a number of countries (although that's dwarfed by number of replica Shelby American Cobras; it's believed there are 50-60,000-odd of them, a remarkable tribute to the 998 originals).  In the twenty-first century, the company decided to reprise the design but the new GT (2004-2006) was hardly a clone and although it shared the basic mechanical layout and the shape (though larger) was close, it was a modern machine.  The car wasn’t called GT40 because the rights to the name had ended up with another company and Ford declined to pay the demanded price.  Over 4000 were built and one special run was a tribute to the 1968-1969 cars in Gulf livery, 343 of the “Heritage Editions” produced.  A second generation of GTs was produced between 2016-2022 and was very modern, the demands of the wind-tunnel this time allowed to prevail over paying tribute to the classic lines of the 1960s.  Although the supercharged 5.4 litre V8 didn’t return and the new car used a turbocharged 3.5 litre (214 cubic inch) V6, it outperformed all its predecessors over the last 60-odd years (all the original GT40 chassis built between 1964-1969) including the 427 cubic inch monsters that won at Le Mans in 1966 & 1967 so it took decades, but eventually there really was a "replacement for displacement".  The V6 also was used also in pick-up trucks which doesn't sound encouraging but versions of the small & big block V8s used in the GT40s also saw similar service, the latter even first appearing in the doomed Edsel.  Production of the second generation was limited to 1350 units, 50 of which were “Heritage Editions” in the Gulf colors, one of several “limited editions”.

Bug

Bug (pronounced buhg)

(1) Any insect of the order Hemiptera, especially any of the suborder Heteroptera (a hemipteran or hemipteron; a hemipterous insect), having piercing and sucking mouthparts specialized as a beak (rostrum) and known loosely as the “true bug”.

(2) Any of various species of marine or freshwater crustaceans.

(3) In casual use, any insect or insect-like invertebrate (ie used often of spiders and such because of their supposed “bug-like” quality).

(4) In casual use, any micro-organism causing disease, applied especially to especially a virus or bacterium.

(5) An instance of a disease caused by such a micro-organism; a class of such conditions.

(6) In casual (and sometimes structured) use, a defect or imperfection, most associated with computers but applied also to many mechanical devices or processes.

(7) A craze or obsession (usually widespread or of long-standing).

(8) In slang, a person who has a great enthusiasm for such a craze or obsession (often as “one bitten by the bug”).

(9) In casual (and sometimes structured) use, a hidden microphone, camera or other electronic eavesdropping device (a clipping of bugging device) and used analogously of the small and effectively invisible (often a single-pixel image) image on a web page, installed usually for the purpose of tracking users.

(10) Any of various small mechanical or electrical gadgets, as one to influence a gambling device, give warning of an intruder, or indicate location.

(11) A mark, as an asterisk, that indicates a particular item, level, etc.

(12) In US horse racing, the five-pound (2¼ kg) weight allowance able to be claimed by an apprentice jockey and by extension (1) the asterisk used to denote an apprentice jockey's weight allowance & (2) in slang, US, a young apprentice jockey (sometimes as “bug boy” (apparently used thus also of young female jockeys, “bug girl” seemingly beyond the pale.)).

(13) A telegraph key that automatically transmits a series of dots when moved to one side and one dash when moved to the other.

(14) In the slang of poker, a joker which may be used only as an ace or as a wild card to fill a straight or a flush.

(15) In commercial printing, as “union bug”, a small label printed on certain matter to indicate it was produced by a unionized shop.

(16) In fishing, a any of various plugs resembling an insect.

(17) In slang, a clipping of bedbug (mostly UK).

(18) A bogy; hobgoblin (extinct).

(19) In slang, as “bug-eyed”, protruding eyes (the medical condition exophthalmos).

(20) A slang term for the Volkswagen Beetle (Type 1; 1938-2003 & the two retro takes; 1997-2019).

(21) In broadcasting, a small (often transparent or translucent) image placed in a corner of a television program identifying the broadcasting network or channel.

(22) In aviation, a manually positioned marker in flight instruments.

(23) In gay (male) slang in the 1980s & 1990s as “the bug”, HIV/AIDS.

(24) In the slang of paleontology, a trilobite.

(25) In gambling slang, a small piece of metal used in a slot machine to block certain winning combinations.

(26) In gambling slang, a metal clip attached to the underside of a table, etc and used to hold hidden cards (a type of cheating).

(27) As the Bug (or Western Bug), a river in Eastern Europe flows through Belarus, Poland, and Ukraine with a total length of 481 miles (774 km).  The Southern Bug (530 miles (850 km)) in south west Ukraine flows into the Dnieper estuary and is some 530 miles (850 km) long.

(28) A past tense and past participle of big (obsolete).

(29) As ISO (international standard) 639-2 & ISO 639-3, the language codes for Buginese.

(30) To install a secret listening device in a room, building etc or on a telephone or other communications device.

(31) To badger, harass, bother, annoy or pester someone.

1615–1625: The original use was to describe insects, apparently as a variant of the earlier bugge (beetle), thought to be an alteration of the Middle English budde, from the Old English -budda (beetle) but etymologists are divided on whether the phrase “bug off” (please leave) is related to the undesired presence of insects or was of a distinct origin.  Bug, bugging & debug are nouns & verbs, bugged is a verb & adjective and buggy is a noun & adjective; the noun plural is bugs.  Although “unbug” makes structural sense (ie remove a bug, as opposed to the sense of “debug”), it doesn’t exist whereas forms such as the adjectives unbugged (not bugged) and unbuggable (not able to be bugged) are regarded as standard.

Nerd humor.

The array of compound forms meaning “someone obsessed with an idea, hobby etc) produced things like “shutterbug” (amateur photographer) & firebug (arsonist) seems first to have emerged in the mid nineteenth century.  The development of this into “a craze or obsession” is thought rapidly to have accelerated in the years just before World War I (1914-1918), again based on the notion of “bitten by the bug” or “caught the bug”, thus the idea of being infected with an unusual enthusiasm for something.  The use to mean a demon, evil spirit, spectre or hobgoblin was first recorded in the mid-fourteenth century and was a clipping of the Middle English bugge (scarecrow, demon, hobgoblin) or uncertain origin although it may have come from the Middle Welsh bwg (ghost; goblin (and linked to the Welsh bwgwl (threat (and earlier “fear”) and the Middle Irish bocanách (supernatural being).  There’s also speculation it may have come from the scary tales told to children which included the idea of a bugge (beetle) at a gigantic scale.  That would have been a fearsome sight and the idea remains fruitful to this day for artists and film-makers needing something frightening in the horror or SF (science fiction) genre.  The use in this sense is long obsolete although the related forms bugbear and bugaboo survive.  Dating from the 1570s, a bugbear was in folklore a kind of “large goblin”, used to inspire fear in children (both as a literary device & for purposes of parental control) and for adults it soon came to mean “a source of dread, resentment or irritation; in modern use it's an “ongoing problem”, a recurring obstacle or adversity or one’s pet peeve.  The obsolete form bugg dates from circa 1620s and was a reference to the troublesome bedbug, the construct a conflation of the middle English bugge (scarecrow, hobgoblin) and the Middle English budde (beetle).  The colloquial sense of “a microbe or germ” dates from 1919, the emergence linked to the misleadingly-named “Spanish flu” pandemic.

Bugs: A ground beetle (left), a first generation der Käfer (the Volkswagen Beetle, 1938-2003) (centre) and an "New Beetle" (1997-2011).  Despite the appearance, the "New Beetle" was of front engine & front-wheel-drive configuration, essentially a re-bodied Volkswagen Golf.  The new car was sold purely as a retro, the price paid for the style, certain packaging inefficiencies.  Few have ever questioned why the original VW Beetle picked up the nickname “bug”.

Like the rest of us, even scientists, entomologists and zoologists generally probably say “bug” in general conversation, whether about the insects or the viruses and such which cause disease but in writing academic papers they’ll take care to be more precise.  Because to most of us “bugs” can be any of the small, creepy pests which intrude on our lives (some of which are actually helpful in that quietly and unobtrusively they dispose of the really annoying bugs which bite us), the word is casually and interchangeably applied to bees, ants, bees, millipedes, beetles, spiders and anything else resembling an insect.  That use may be reinforced by the idea of the thing “bugging” us by their very presence.  To the professionals however, insects are those organisms in the classification Insecta, a very large class of animals, the members of which have a three-part body, six legs and (usually) two pairs of wings whereas a bug is a member of the order Hemiptera (which in the taxonomic system is within the Insecta class) and includes cicadas, aphids and stink bugs; to emphasize the point, scientists often speak of those in the order Hemiptera as “true bugs”.  The true bugs are those insects with mouthparts adapted for piercing and sucking, contained usually in a beak-shaped structure, a vision agonizingly familiar to anyone who has suffered the company of bedbugs.  That’s why lice are bugs and cockroaches are not but the latter will continue to be called bugs, often with some preceding expletive.

9 September 1947: The engineer's note (with physical evidence) of electronic computing's "first bug".

In computing, where the term “bug” came to be used to describe “glitches, crashes” and such, it has evolved to apply almost exclusively to software issues and even if events are caused by hardware flaws, unless it’s something obvious (small explosions, flame & smoke etc) most users probably assume a fault in some software layer.  The very first documented bug however was an interaction recorded on 9 September 1947 between the natural world and hardware, an engineer’s examination of an early (large) computer revealing an insect had sacrificially landed on one of the circuits, shorting it out and shutting-down the machine.  As proof, the unfortunate moth was taped to the report.  On a larger scale (zoologically rather than the hardware), the problem of small rodents such as mice entering the internals of printers, there to die from various causes (impact injuries, starvation, heat etc) remains not uncommon, resulting sometimes in mechanical damage, sometimes just the implications of decaying flesh.

Revelle's Bug Bomb, 1970.

The idea of a bug as a “defect, flaw, fault or glitch” in a mechanical or electrical device was first recorded in the late 1800s as engineer’s slang, the assumption being they wished to convey the idea of “a small fault” (and thus easily fixed, as opposed to some fundamental mistake which would necessitate a re-design).  Some sources suggest the origin lies with Thomas Edison (1847-1931) who is reported as describing the consequences of an insect “getting into the works”.  Programmers deploy an array of adjectives to "bug" (major, minor, serious, critical & non-critical etc) although between themselves (and certainly when disparaging of the code of others) the most commonly heard phrase is probably “stupid bug”.  The “debugging” (also as de-bugging) process is something with a wide definition but in general it refers to any action or set of actions taken to remove errors.  The name of the debug.exe (originally debug.com) program included with a number of (almost all 16 & 32-bit) operating systems was a little misleading because in addition to fixing things, it could be used for other purposes and is fondly remembered by those who wrote Q&D (quick & dirty) work-arounds which, written in assembler, ran very fast.  The verb debug was first used in 1945 in the sense of “remove the faults from a machine” and by 1964 it appeared in field service manuals documenting the steps to be taken to “remove a concealed microphone”.  Although the origin of the use of “bug” in computing (probably the now most commonly used context) can be traced to 1947, the term wasn’t widely used beyond universities, industry and government sites before the 1960s when the public first began to interact at scale with the implications (including the bugs) of those institutions using computerized processes.  Software (or any machinery) badly afflicted by bugs can be called “buggy”, a re-purposing of the use of an adjective dating from 1714 meaning “a place infested with bugs”.

Some bugs gained notoriety.  In the late 1990s, it wasn’t uncommon for the press to refer to the potential problems of computer code using a two-numeral syntax for years as the “Y2K bug” which was an indication of how wide was the vista of the common understanding of "bug" and one quite reasonable because that was how the consequences would be understood.  A massive testing & rectification effort was undertaken by the industry (and corporations, induced by legislation and the fear of litigation) and with the coming of 1 January 2000 almost nothing strange happened and that may also have been the case had nothing been done but, on the basis of the precautionary principle, it was the right approach.  Of course switching protocols to use four-numeral years did nothing about the Y10K bug but a (possible) problem 8000 years hence would have been of little interest to politicians or corporate boards.  Actually, Ynnn~K bugs will re-occur (theoretically with decreasing frequency) whenever a digit needs to be added.  The obvious solution is trailing zeros although if one thinks in terms of infinity, it may be that, in the narrow technical sense, such a solution would just create an additional problem although perhaps one of no practical significance.  Because of the way programmers exploit the way computers work, there have since the 1950s been other date (“time” to a computer) related “bugs” and management of these and the minor problems caused has been handled well.  Within the industry the feeling is things like the “Y2038 problem” will, for most of the planet, be similarly uneventful.

The DOSShell, introduced with PC-DOS 4.0; this was as graphical as DOS got.  The text-based DOSShell was bug-free and a reasonable advance over what came before but the power users had already adopted XTree as their preferred file handler.

Bugs can also become quirky industry footnotes.  As late as 1987, IBM had intended to release the update of PC-DOS 3.3 as version 3.4, reflecting the corporation’s roadmap of DOS as something of an evolutionary dead-end, doomed ultimately to end up in washing machine controllers and such while the consumer and corporate market would shift to OS/2, the new operating system which offered pre-emptive multi-tasking and access to bigger storage and memory addressing.  However, at that point, both DOS & OS/2 were being co-developed by IBM & Microsoft and agreement was reached to release a version 4 of DOS.  DOS 4 also included a way of accessing larger storage space (through a work-around with a program called share.exe) and more memory (in a way less elegant than the OS/2 approach but it did work, albeit more slowly), both things of great interest to Microsoft because they would increase the appeal of its upcoming Windows 3.0, a graphical shell which ran on top of DOS; unlike OS/2, Windows was exclusive to Microsoft and so was the revenue stream.  Unfortunately, it transpired the PC-DOS 4.0 memory tricks were “buggy” when used with some non-IBM hardware and the OS gained a bad reputation from which it would never recover.  By the time the code was fixed, Microsoft was ready to release its own version as MS-DOS 4.0 but, noting all the bad publicity, after some cosmetic revisions, the mainstream release was MS-DOS 4.01.  In the code of the earlier, bug-afflicted bits, there seems no substantive difference between MS-DOS 4.01 the few extant copies of MS-DOS 4.0.

Herbie, the love bug

Lindsay Lohan (left) among the bugs (centre) on the red carpet for the Los Angeles premiere of Herbie Fully Loaded (a 2005 remake of The Love Bug (1968)), El Capitan Theater, Hollywood, Los Angeles, 19 June 19, 2005.  The Beetle (right) was one of the many replica “Herbies” in attendance and, on the day, Ms Lohan (using the celebrity-endorsed black Sharpie) autographed the glove-box lid, removed for the purpose. 

In idiomatic and other uses, bug has a long history.  By the early twentieth century “bugs” meant “mad; crazy" and by then “bug juice” had been in use for some thirty years, meaning both “propensity of the use of alcoholic drink to induce bad behaviour” and “bad whiskey” (in the sense of a product being of such dubious quality it was effectively a poison).  A slang dictionary from 1811 listed “bug-hunter” as “an upholsterer”, an allusion to the fondness bugs and other small creatures show for sheltering in the dark, concealed parts of furniture.  As early as the 1560s, a “bug-word” was a word or phrase which “irritated or vexed”.  The idea of “bug-eyed” was in use by the early 1870s and that’s thought either to be a humorous mispronunciation of bulge or (as is thought more likely) an allusion to the prominent, protruding eyes of creatures like frogs, the idea being they sat on the body like “a pair of bugs”.  The look became so common in the movies featuring aliens from space that by the early 1950s the acronym BEM (bug-eyed monster) had become part of industry slang.  The correct term for the medical condition of "bulging eyes" is exophthalmos.

Lindsay Lohan in promotional poster for Herbie: Fully Loaded (2005).

To “bug someone” in the sense of “to annoy or irritate” seems not to have been recorded until 1949 and while some suggest the origin of that was in swing music slang, it remains obscure.  The now rare use of “bug off” to mean “to scram, to skedaddle” is documented since 1956 and is of uncertain origin but may be linked to the Korean War (1950-1953) era US Army slang meaning “stage a precipitous retreat”, first used during a military reversal.  The ultimate source was likely the UK, Australian & New Zealand slang “bugger off” (please leave).  The “doodle-bug” was first described in 1865 and was Southern US dialect for a type of beetle.  In 1944, the popular slang for the German Vergeltungswaffen eins (the V-1 (reprisal weapon 1) which was the first cruise missile) was “flying bomb” or “buzz bomb”) but the Royal Air Force (RAF) pilots preferred “doodle-bug”.

The ultimate door-stop for aircraft hangers: Bond Bug 700.

The popularity of three wheeler cars in the UK during the post-war years was a product of cost breakdown.  They were taxed at a much lower rate than conventional four-wheel vehicles, were small and thus economical and could be operated by anyone with only a motorcycle licence.  Most were genuine (if not generous) four-seaters and thus an attractive alternative for families and, being purely utilitarian, there were few attempts to introduce elements of style.  The Bond Bug (1970-1974) was an exception in that it was designed to appeal to the youth market with a sporty-looking two-seater using the then popular “wedge-styling” and in its most powerful form it could touch 80 mph (130 km/h), faster than any other three wheeler available.  The bug was designed by Vienna-born British designer Tom Karen (1926–2022) who intended it as a “Ferrari for 16-year-olds” which may hint he knew more about cars than young males but in the 1970s such comparisons often were made, a tester in one magazine describing the diminutive Fiat 127 (1971-1983) as “the 0.9 litre Ferrari” which was journalistic licence writ large but people knew what he meant.

An infestation of Bugs.

However, the UK in 1973 introduced VAT (value-added tax, a consumption tax) and this removed many of the financial advantages three-wheelers offered (it also doomed much of the “kit-car” business in which customers could buy the parts and assemble them with their own labor).  In an era of rising prosperity, the appeal of the compromise waned and coupled with some problems in the early productions runs, in 1974, after some 2¼ thousand Bugs had been built, the zany little machine was dropped; not even the oil crisis of the time (which had doomed a good number of bigger, thirstier cars) and the nasty recession which followed could save it.  Even in its best years it was never all that successful, essentially because it was really a novelty and there were “real” cars available for less money.  Still, the survivors have a following in their niche at the lower end of the collector market and it's a machine truly like no other.

The business of spying is said to be the “second oldest profession” and even if not literally true, few doubt the synergistic callings of espionage and war are among man’s earliest and most enduring endeavors.  Although the use of “bug” to mean “equip with a concealed microphone” seems not to have been in use until 1946, bugging devices probably go back thousands of years (in a low-tech sort of way) and those known to have been used in Tudor-era England (1485-1603) are representative of the way available stuff was adapted, the most popular being tubular structures which, if pressed against a thin wall (or preferably a door’s keyhole) enabled one to listen to what was being discussed in a closed room.  Bugging began to assume its modern form when messages began to be transmitted over copper wires which could stretch for thousands of miles and the early term for a “phone bug” was “phone tap”, based upon the idea of “tapping into” the line as one might a water pipe.  Bugs (the name picked-up because many of the early devices were small, black and “bug-like”), whether as concealed microphones or phone taps, swiftly became part of the espionage inventory in diplomacy, commerce and crime and as technology evolved, so did the bugging techniques.

Henry Cabot Lodge Jr (1902–1985), US Ambassador to the UN (United Nations) at a May 1960 session of the Security Council, using the Great Seal bug to illustrate the extent of Soviet bugging.  The context was a tu quoque squabble between the Cold War protagonists, following Soviet revelations about the flight-paths of the American's U2 spy planes.  Lodge would be Richard Nixon’s (1913-1994; US president 1969-1974) running mate in that year's presidential election.     

A classic bug of High Cold War was the Great Seal bug, (known to the security services as the thing), a Soviet designed and built concealed listening device which was so effective because it used passive transmission protocols for its audio signal, thereby rendering it invisible to conventional “bug-detection” techniques.  The bug was concealed inside large, carved wooden rendition of the US Great Seal which, in 1945, the Kremlin presented as a “gift of friendship” to the US Ambassador to the USSR Averell Harriman (1891-1986); in a nice touch, it was a group of Russian school children who handed over the carving.  Sitting in the ambassador’s Moscow office for some seven years, it was a masterpiece of its time because (1) being activated only when exposed to a low-energy radio signal which Soviet spies would transmit from outside, when subjected to a US “bug detection” it would appear to be a piece of wood and (2) as it needed no form of battery or other power supply (and indeed, no maintenance at all), its lifespan was indefinite.  Had it not by chance been discovered by a communications officer at the nearby British embassy who happened to be tuned to the same frequency while the Soviets were sending their signal, it may well have remained in place for decades.  Essentially, the principles of the Great Seal bug were those used in modern radio-frequency identification (RFID) systems.