Editing 2606: Weird Unicode Math Symbols
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==Explanation== | ==Explanation== | ||
− | + | {{incomplete|Created by SNAKES OVER THERE - Please change this comment when editing this page. Do NOT delete this tag too soon.}} | |
− | + | This comic proposes joke explanations for various unicode symbols with obscure or no known uses. | |
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{| class="wikitable" | {| class="wikitable" | ||
|+ Symbols | |+ Symbols | ||
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! Codepoint !! Symbol !! Unicode Name !! Actual use !! Randall's meaning || Explanation | ! Codepoint !! Symbol !! Unicode Name !! Actual use !! Randall's meaning || Explanation | ||
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− | | U+29CD || | + | | U+29CD || ⧍ || Triangle with Serifs At Bottom || No standard use, but resembles half of the {{w|Hobo#Hobo signs and graffiti|Hobo sign}} for "Rich people live here" (the other half being a top hat)[https://www.logodesignlove.com/hobo-signs-and-symbols] || Shark || May look like a shark fin sticking out of the water. |
|- | |- | ||
− | | U+23E7 || | + | | U+23E7 || ⏧ || Electrical Intersection || Indicates where wires branch off || Traffic circle || May look like a {{w|roundabout}}. |
|- | |- | ||
− | | U+2A33 || | + | | U+2A33 || ⨳ || {{w|Smash product}} || Result of dividing two {{w|product spaces}} || ''Hashtag'' || Looks somewhat like the {{w|Number sign|hash}} symbol (#) – commonly used for indicating tags called {{w|hashtag}}s in social media – turned by 45 degrees. |
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− | | U+2A7C || | + | | U+2A7C || ⩼ || Greater-Than with Question Mark Above || Used in proofs to indicate a greater-than relation that should exist but hasn't been proven yet (non-rigorous) || Confused alligator || One metaphor used when teaching inequality signs in primary school is that the sign looks like an alligator mouth "eating" the larger number. |
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− | | U+299E || | + | | U+299E || ⦞ || Angle with S Inside || Plural for the angle symbol (∠) [https://www.quora.com/Unicode-How-is-the-s-in-triangle-glyph-used-in-mathematics][https://www.birdvilleschools.net/cms/lib2/TX01000797/Centricity/Domain/1114/Homework%20Helper%20Unit%203%20ch%209-10.pdf] rarely used || Snack || May look like a mouth eating an S, where the S symbolizes some snack food. |
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− | | U+2A04 || | + | | U+2A04 || ⨄ || {{w|Arity|N-ary}} Union Operator with Plus || Disjoint union[https://books.google.com/books?id=531cAgAAQBAJ&pg=PA165&lpg=PA165&dq=%E2%A8%84&source=bl&ots=oYXkMNXP-T&sig=ACfU3U2QvMRBkD7uVG0OSumKI0JQtjTIKA&hl=en&sa=X&ved=2ahUKEwios862ypL3AhWXVTABHTnQALQQ6AF6BAgKEAM] (joining two sets that have no elements in common) || Drink refill || Looks like a cup with a plus to indicate adding drink to the cup. |
|- | |- | ||
− | | U+2B48 || | + | | U+2B48 || ⭈ || Rightwards Arrow Above Reverse Almost Equal To || pairs with ⭂ but does not appear to be in regular use || Snakes over there || Looks like two squiggles to represent snakes and an arrow indicating the direction where they may be found. |
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− | | U+225D || | + | | U+225D || ≝ || Equal To By Definition || Indicates an equation where the left side is to be defined as the right side[https://www.reddit.com/r/math/comments/1z1mty/can_someone_please_explain_the_equal_to_by/] usually used in proofs to indicate the sought definition has been reached || Definitely, for sure || "Def" is understood as "definitely"; the equal sign looks like a double underline, indicating heavy emphasis. |
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− | | U+237C || | + | | U+237C || ⍼ || Right Angle with Downwards Zigzag Arrow || No purpose is known[https://ionathan.ch/2022/04/09/angzarr.html]; speculation includes "Y axis continues downward" and "diode with a gate". || Larry Potter || Looks like the letter "L" and a lightning bolt. {{w|Harry Potter (character)|Harry Potter}} is known for having a lightning bolt-shaped scar on his forehead. The character {{w|Legal_disputes_over_the_Harry_Potter_series#Nancy_Stouffer|Larry Potter}} figured in a fraudulent legal claim against J.K. Rowling. |
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− | | U+2A50 || | + | | U+2A50 || ⩐ || Closed Union with Serifs and Smash Product || Indicates that a collection of topological spaces is {{w|Union-closed sets conjecture|closed}} when taking arbitrary unions and smash products, for use in a serif font. That is, if you take the union of any collection of topological spaces in the collection (even uncountably many), or the smash product of them, the result will also be in that collection. This is apparently important because the sets can't be isomorphic (one cannot be rearranged to be exactly the other) [https://mathoverflow.net/questions/196084/counterexample-for-associativity-of-smash-product] || Spider caught with a cup and index card || Spiders or other bugs found within someone's house or workspace may be caught with a glass and something flat, often a card or a magazine, to be released outside. |
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− | | U+2A69 || | + | | U+2A69 || ⩩ || Triple Horizontal Bar with Triple Vertical Stroke || Decorative || ℍ𝕒𝕤𝕙𝕥𝕒𝕘 || Hash symbol with one extra vertical and horizontal line, or perhaps a hash symbol which has been accidentally double-struck or overprinted. |
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− | | U+2368 || | + | | U+2368 || ⍨ || APL Functional Symbol Tilde Diaeresis || Indicates that the {{w|negation|logical not}} operation should be performed on each of the symbols that follow || :/ || Looks like a confused or disappointed face. Randall's use is in fact common among {{w|APL (programming language)|APL}} programmers in the comments, as documented [https://aplwiki.com/wiki/APL_Orchard#Emoticons here]. |
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− | | U+2118 || | + | | U+2118 || ℘ || Script Capital P || An eccentric, Gothic-esque capital Roman P first used by Weierstrass for his self-named "p-function." This symbol is universally used for the {{w|Weierstrass Elliptic Function|p-function}} and apparently has no name except "Weierstrass-p." It is reminiscent of ∂, a stylized cursive d used for partial differentials or ∫, a stylized long s used for integrals. || Snake || This symbol coils around like a long snake, with a tapering-off tail on one end and a small "head" on the other. |
− | || Snake || This symbol coils around like a long snake, with a tapering-off tail on one end and a small "head" on the other. | ||
|- | |- | ||
− | | U+2AC1 || | + | | U+2AC1 || ⫁ || Subset with Multiplication Sign Below || Indicates that one set is subset of another by means of the cross product || "User experience", written sideways || Looks like the letters Ux written sideways; Ux is an abbreviation for {{w|user experience}}. |
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− | | U+232D || | + | | U+232D || ⌭ || {{w|Cylindricity}} || A symbol used in geometric dimensioning and tolerancing (GD&T) to represent a parameter called "cylindricity" which describes the statistical deviation of an ensemble of surfaces from a reference cylinder. [https://cimquest-inc.com/metrology-minute-cylindricity/ example use] || Rolling dough between your hands to shape it into a ball || Looks like two flat hands (perhaps like stickfigure arms) rolling a ball between them. Rolling dough between one's hands to make it into a ball is an important step in making many kinds of pastry. |
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− | | U+2A13 || | + | | U+2A13 || ⨓ || Line Integration with Semicircular Path Around Pole || Very rare symbol for half of a closed {{w|Contour integration|contour}} or {{w|Line integral|line}} integral which contains the {{w|Origin (mathematics)|origin}} in its interior. Contour integrals which circle the origin are very important in complex analysis. If such an integral were split into two parts, each could be represented by this symbol. |
+ | Might be mistaken for ⨔ (Integral not including the {{w|Zeros and poles|pole}}) [https://math.stackexchange.com/questions/2299363/where-is-the-%E2%A8%93-integral-symbol-defined] | ||
|| Integral that avoids a bee on the whiteboard || Looks like an {{w|integral}} symbol with a bump that goes around a dot, as if a professor was drawing an integral on a whiteboard but did not want to disturb a bee that had landed right in the path of their marker. | || Integral that avoids a bee on the whiteboard || Looks like an {{w|integral}} symbol with a bump that goes around a dot, as if a professor was drawing an integral on a whiteboard but did not want to disturb a bee that had landed right in the path of their marker. | ||
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− | | U+2A0B (title text)|| | + | | U+2A0B (title text)|| ⨋ || Summation with Integral || The sum of the sum of the discrete elements (∑) and the integrals (∫)over the connected pieces. This symbol requires context to be meaningful but could occur, for instance, when computing probabilities using mixed distributions. |
[https://twitter.com/fermatslibrary/status/1308743505309822977 see also] | [https://twitter.com/fermatslibrary/status/1308743505309822977 see also] | ||
− | || Mathematicians need to calm down || | + | || Mathematicians need to calm down || Since the two symbols combined are kinds of summation the symbol seem unnecessary at first glance. The comment given may make fun of mathematicians' tendency to form increasingly complex expressions in their work. |
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|} | |} | ||
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+ | This comic may have been inspired by [https://ionathan.ch/2022/04/09/angzarr.html this blog post], which went viral (in a limited sense) the same day the comic was published. | ||
==Transcript== | ==Transcript== | ||
− | + | {{incomplete transcript|Do NOT delete this tag too soon.}} | |
− | + | ||
+ | [Title:] Weird Unicode math symbols | ||
+ | |||
+ | [Subtitle:] And their meanings | ||
{| | {| | ||
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| U+23E7 || ⏧ || Traffic circle | | U+23E7 || ⏧ || Traffic circle | ||
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− | | U+2A33 || ⨳ || [ | + | | U+2A33 || ⨳ || Hashtag [the text is slanted counterclockwise] |
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| U+299E || ⦞ || Snack | | U+299E || ⦞ || Snack | ||
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| U+2118 || ℘ || Snake | | U+2118 || ℘ || Snake | ||
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− | | U+2AC1 || ⫁ || [The words "user experience" rotated | + | | U+2AC1 || ⫁ || [The words "user experience" rotated counterclockwise 90 degrees] |
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| U+232D || ⌭ || Rolling dough between your hands to shape it into a ball | | U+232D || ⌭ || Rolling dough between your hands to shape it into a ball |