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”.

Curious

Curious (pronounced kyoor-ee-uhs)

(1) Eager to learn or know; inquisitive; interested, inquiring

(2) Prying; meddlesome, overly inquisitive.

(3) Arousing or exciting speculation, interest, or attention through being inexplicable or highly unusual; odd; strange.

(4) Made or prepared skilfully (archaic).

(5) Done with painstaking accuracy or attention to detail (archaic).

(6) Careful; fastidious (archaic).

(7) Marked by intricacy or subtlety (archaic).

(8) In inorganic chemistry, containing or pertaining to trivalent curium (rare).

1275–1325: From the Middle English curious, from the Old French curius (solicitous, anxious, inquisitive; odd, strange (which endures in Modern French as curieux)), from the Latin cūriōsus (careful, diligent; inquiring eagerly, meddlesome, inquisitive), the construct being cūri- (a combining form of cūra (care) + -ōsus .  The –ōsus suffix (familiar in English as –ous) was from Classical Latin from -ōnt-to-s from -o-wont-to-s, the latter form a combination of two primitive Indo-European suffixes: -went & -wont.  Related to these were –entus and the Ancient Greek -εις (-eis) and all were used to form adjectives from nouns.  In Latin, -ōsus was added to a noun to form an adjective indicating an abundance of that noun.  The English word was cognate with Italian curioso, the Occitan curios, the Portuguese curioso and the Spanish curioso.  The original sense in the early fourteenth century appears to have been “subtle, sophisticated” but by the late 1300s this had been augmented by “eager to know, inquisitive, desirous of seeing” (often in a bad (ie “busybody”) sense and also “wrought with or requiring care and art”, all these meaning reflecting the Latin original.  The objective sense of “exciting curiosity” was in use by at least 1715 but in booksellers' catalogues of the mid-nineteenth century, the word was a euphemism for “erotic, pornographic”, such material called curiosa the Latin neuter plural of cūriōsus.  That was not however what was in the mind of Charles Dickens (1812–1870) when he wrote The Old Curiosity Shop (1840-1841).

The derived forms include noncurious, overcurious, supercurious, uncurious & incuruious.  Both uncurious and incurious are rare and between them there is a difference in meaning and usage, but it is much weaker and less consistently observed than the distinction drawn (though not always observed) between disinterest and uninterest.  Incurious means “lacking curiosity; not inclined to inquire or wonder” and often carries a critical or evaluative tone, implying intellectual complacency or narrow-mindedness; it can be applied to individuals but seems more often used of groups.  Uncurious means “usually not curious” and tends to be descriptive rather than judgmental.  Being rarely used and obscure in what exactly is denoted, some style guides list them as awkward and best avoided, recommending being explicit about what is meant.  Curious is an adjective, curiousness & curiosity are nouns, curiously is an adverb; the noun plural curiosities.  The comparative more curious or curiouser and the superlative most curious or curiousest

The proverb “curiosity killed the cat” means “one should not be curious about things that don’t concern one”.  The phrase “curiouser and curiouser” comes from Alice’s Adventures in Wonderland (1865) by the English author Lewis Carroll (pen name of Charles Lutwidge Dodgson (1832–1898)).  As a modern, idiomatic form, it’s used to describe or react to an increasingly mysterious or peculiar situation (though usually not one thought threatening).  Alice made her famous exclamation after experiences increasingly bizarre transformations and other strange events in Wonderland; later, what was described would be thought surrealistic.  The phrase has endured and it appears often in literature and popular culture, London’s Victoria and Albert Museum even holding the Alice: Curiouser and Curiouser event.  The author’s use of “bad English” was deliberate, a device to convey the child’s sense of bewildered confusion.  In standard English, the comparative of "curious" is “more curious” with the –er suffix usually appended to words with one or two syllables.  The word “curiouser” thus inhabits a special niche in that although mainstream dictionaries usually list it as “informal” or “non-standard” (ie “wrong”), unlike most “mistakes”, because it’s a literary reference, it’s a “respectable” word (if used in the phrase).  In that, it’s something like “it ain’t necessarily so”.

Depiction of the mad hatter’s tea party by Sir John Tenniel (1820-1914) in an edition called Nursery Alice (1890), an abridged version of Alice's Adventures in Wonderland intended for children under five (the original drawing now held by the British Museum).  The book contained 20 illustrations by Sir John who also provided the artwork for the full-length publication.  A fine craftsman, Sir John was noted also for his moustache which “out-Nietzsched” Friedrich Nietzsche (1844–1900).  Despite much later speculation, no evidence has ever emerged to suggest Lewis Carroll was under the influence of drugs when writing the “Alice” books

Special derived adjectival uses of curious include the portmanteau word “epicurious” (curious about food, especially wishing to try new dishes and cuisines), the construct being epicu(reean) +‎ (cu)rious.  Although the notion of Epicureans (those who are followers of Epicureanism) being focused on food is overstated, that’s the way the word usually appears in popular use.  “Indy-curious” is from UK politics and refers to those interested in the possibility of independence for Wales, without necessarily being a supporter of the proposal.  Those who are “veg-curious” are interested in or contemplating a vegetarian or vegan diet.

The word “curious” became an element in the punch-lines of some “gay jokes” (a now extinct species outside the gay community) but survived in derived forms in sexology, presumably because they can be used neutrally.  The constructs include (1) “pancurious” (exhibiting a state of uncertainty about one's pansexual or panromantic status), (2) “bi-curious” (interested in having relationships with both men and women, curious about one's potential bisexuality; considering a first sexual experience with a member of the same sex (used especially of heterosexuals), (3) gay-curious (curious about one's homosexuality; curious to try homosexuality (4) homocurious (questioning whether one is homosexual), (5) polycurious (curious about or open to polyamory; potentially interested in having relationships with multiple partners and (6) trans-curious (interested in one's potential transness or the experience of a sexual encounter with a trans person.  None of these forms seem to be in frequent use and some may have been created to “cover the field” and there may be some overlap (such as between pancurious and polycurious) and that at least some may be spectrum conditions seems implicit in the way dictionaries list comparative and superlative forms (eg more bi-curious; most bi-curious).

The synonyms include enquiring, inquiring; exquisitive; investigative and the now rare peery, the latter a use of curious in the vein of the “meddling priest” (ie a “busybody” tending to ask questions or wishing to explore or investigate matters not of their concern).  Such a person could be labelled a quidnunc (gossip-monger, one who is curious to know everything that happens) a word (originally as quid nunc) from the early 1700s, the construct being the Latin quid (what? (neuter of interrogative pronoun quis (who?) from the primitive Indo-European root kwo-, stem of relative and interrogative pronouns)) + nunc (now); the idea was of someone habitually asking “What's the news?” and that phrase was one with which for decades the press baron Lord Beaverbrook (Maxwell Aitken, 1879-1964) would pester his editors.  The other group of synonyms reference the word in its “funny-peculiar” sense and include queer, curious: weird, odd, strange & bizarre.  Such an individual, concept or object can be called “a curiosity” and that’s reflected in the noun “curio” which dates from 1851 and meant originally “piece of bric-a-brac from the Far East” and was a short form of curiosity in the mid seventeenth century sense of “object of interest”’ by the 1890s it was in use to refer to rare or interesting bric-a-brac (or just about anything otherwise unclassified) from anywhere.  The related curioso was in use by the 1650s and for two centuries-odd was a word describing “one who is curious" (of science, art, metaphysics and such) or “one who admires or collects curiosities”; it was from the Italian curioso (a curious soul (person)).

1971 Plymouths in Curious Yellow (code GY3): 'Cuda 340 (left) and GTX (right). 

Although buyers of Ferraris, Porsches, Lamborghinis and such still often order cars in bright colors, most of the world’s fleet had for some years been restricted mostly to white, black and variants of silver & gray; it’s a phase the world is going through and it can’t be predicted how long this visually sober ere will last.  In the US in the late 1960s it was different and like other manufacturers, Chrysler had some history in the coining of fanciful names for the “High Impact” colors dating from the psychedelic era.  Emerging from their marketing departments came Plum Crazy, In-Violet, Tor Red, Limelight, Sub Lime, Sassy Grass, Panther Pink, Moulin Rouge, Top Banana, Lemon Twist & Citron Yella.  That the most lurid colors vanished during the 1970s was not because of changing tastes but in response to environmental & public health legislation which banned the use of lead in automotive paints; without the additive, production of the bright colours was prohibitively expensive.  Advances in chemistry meant that by the twenty-first century brightness could be achieved without the addition of lead so Dodge revived psychedelia for a new generation although Sub Lime became Sublime.

Criterion's re-issue of I Am Curious (Blue) and I Am Curious (Blue) with edited (colorized) artwork.  The original posters were monochrome.  

Two years into the first administration of Richard Nixon (1913-1994; US VPOTUS 1953-1961 & POTUS 1969-1974), and a year on from his declaration of a “War on Drugs”, it was obvious the psychedelic era was over but bright colors were still popular so come were carried over although the advertising became noticeably “less druggy”.  Although it may be an industry myth, the story told is that Plum Crazy & In-Violet (lurid shades of purple) were in 1969 late additions because the killjoy board refused to sign-off on Statutory Grape but despite that, Plymouth for 1971 decided to change the name of their vibrant hue of yellow from “Citron Yella” to “Curious Yellow” (code GY3), that apparently borrowed from the controversial 1967 Swedish erotic film I Am Curious (Yellow), directed by Vilgot Sjöman (1924-2006); it was followed the following year by I Am Curious (Blue), the two intended originally as 3½ hour epic.  As promoted at the time, the films were advertised as “I Am Curious: A Film in Yellow” and “I Am Curious: A Film in Blue”, the mention of the colors an allusion to the Swedish flag.

Lindsay Lohan does her bit to revive Chrysler’s 1971 Curious Yellow, the New York Post’s Alexa magazine, 5 December 2024.

A footnote to the earlier film is an uncredited appearance by Olof Palme (1927–1986; Prime Minister of Sweden 1969-1976 & 1982-1986) whose assassination remains unsolved. The films are very much period pieces of a time when on-screen depictions of sex were for the first time in some places liberated from most censorship and while this produced an entire genre of blends of eroticism and pornography, some directors couldn’t resist interpolating political commentary (of the left and right); at the time, just about everything (sex included) could be sociological.  Critic and audiences mostly were unconvinced but films like the “Curious” brace and Michelangelo Antonioni’s (1912–2007) Zabriskie Point (1970) later gained a cult following.  Problems encountered during production resulted in the release of Zabriskie Point being delayed until 1970 but in retrospective this was a blessing because if anyone doubted the spirit of the 1960s had died, the film was there to remove all doubt.  A commercial failure, visually, it remains a feast for students of pre-digital cinematography and some maintain the best way to enjoy subsequent viewings is to mute the sound and play the soundtrack on repeat; unsynchronized with the scenes, its an experience rewarding in its own way.