Editing X (section)

==Other uses==
{{main|X (disambiguation)}}

* [[X mark]] has a widely accepted meaning of "negative" or "wrong".
* The [[Roman numeral]] X represents the number 10.<ref>{{cite book |last=Gordon |first=Arthur E. | url=https://archive.org/details/illustratedintro0000gord |url-access=registration |quote=roman numerals. | title=Illustrated Introduction to Latin Epigraphy | publisher=University of California Press | date=1983 | access-date=3 October 2015 | page=[https://archive.org/details/illustratedintro0000gord/page/44 44]|isbn=9780520038981 }}</ref><ref>{{cite book | last=King | first=David A. | url=https://books.google.com/books?id=PapljPXaSbwC&q=roman%20numerals%20letters&pg=PA282 | title=The Ciphers of the Monks | year=2001 | page=282 | publisher=Franz Steiner Verlag | isbn=9783515076401 | quote=In the course of time, '''I''', '''V''' and '''X''' became identical with three letters of the alphabet; originally, however, they bore no relation to these letters. | access-date=2020-11-22 | archive-date=2021-01-04 | archive-url=https://web.archive.org/web/20210104092429/https://books.google.com/books?id=PapljPXaSbwC&q=roman%20numerals%20letters&pg=PA282 | url-status=live }}</ref>
* In [[mathematics]], ''x'' is commonly used as the name for an [[independent variable]] or unknown value. The modern tradition of using ''x'', ''y'', and ''z'' to represent an [[Unknown (mathematics)|unknown (''incognita'')]] was introduced by [[René Descartes]] in ''[[La Géométrie]]'' (1637).<ref>{{cite book |url=https://books.google.com/books?id=_byqAAAAQBAJ&q=unknown&pg=PA380 |title=A History of Mathematical Notations |first=Florian |last=Cajori |publisher=Open Court Publishing |year=1928 |place=Chicago |page=381 |isbn=9780486161167 |access-date=2020-11-22 |archive-date=2021-04-13 |archive-url=https://web.archive.org/web/20210413173747/https://books.google.com/books?id=_byqAAAAQBAJ&q=unknown&pg=PA380 |url-status=live }} See [[History of algebra#The symbol x|History of algebra]].</ref> As a result of its use in [[algebra]], X is often used to represent unknowns in other circumstances (e.g. [[X-rays]], [[Generation X]], ''[[The X-Files]]'', and ''[[The Man from Planet X]]'').
* On some [[Identity document|identification documents]], the letter X represents a [[non-binary gender]], where F means female and M means male.<ref name="Science as Culture">{{cite journal | first = Ingrid | last = Holme | title = Hearing People's Own Stories | journal = Science as Culture | volume = 17 | issue = 3 |pages = 341–344| doi = 10.1080/09505430802280784 | date = 2008 | s2cid = 143528047 }}</ref><ref name="nzpass">{{cite web|url=http://www.passports.govt.nz/Transgender-applicants|title=New Zealand Passports - Information about Changing Sex / Gender Identity|access-date=6 October 2014|url-status = live|archive-url=https://web.archive.org/web/20140923055123/http://www.passports.govt.nz/Transgender-applicants|archive-date=23 September 2014}}</ref>
* In the [[Cartesian coordinate system]], ''x'' is used to refer to the horizontal axis.
* It is also sometimes used as a [[typographic approximation]] for the [[multiplication sign]], {{char|×}}. In mathematical typesetting, ''x'' meaning an algebraic variable is normally in [[italic type]] (<math>x\!</math>), partly to avoid confusion with the multiplication symbol. In fonts containing both ''x'' (the letter) and × (the multiplication sign), the two glyphs are dissimilar.
* It can be used as an abbreviation for 'between' in the context of historical dating; e.g. "1483 x 1485".
* Maps and other images sometimes use an X to label a specific location, leading to the expression "X marks the spot".<ref>{{cite web | url=http://www.dictionary.com/browse/x-marks-the-spot | title=X marks the spot | access-date=21 June 2016 | archive-date=4 June 2016 | archive-url=https://web.archive.org/web/20160604015834/http://www.dictionary.com/browse/x-marks-the-spot | url-status=live }}</ref>
* In art or fashion, the use of X indicates a collaboration by two or more artists, e.g. Aaron Koblin x Takashi Kawashima. This application, which originated in Japan, now extends to other kinds of collaboration outside the art world.<ref>{{cite web|url=http://arkitip.com/product/x-mark-of-collaboration-issue-no-0053x/|title=X: Mark of Collaboration - Issue No. 0053X - Arkitip, Inc.|website=arkitip.com|access-date=2016-03-22|archive-date=2016-05-17|archive-url=https://web.archive.org/web/20160517184918/http://arkitip.com/product/x-mark-of-collaboration-issue-no-0053x/|url-status=live}}</ref> This usage mimics the use of a similar mark in [[Hybrid name (botany)|denoting botanical hybrids]], for which scientifically the [[Multiplication sign#Uses|multiplication ×]] is used, but informally, a lowercase "x" is also used.
* {{Anchor|Kiss}}At the end of a letter or other correspondence, '[[Hugs and kisses|x]]' can mean a kiss;<ref>{{Cite news|last=Epstein|first=Nadine|date=2020-10-07|title=A whole lot of history behind 'x' and 'o', kiss and hug|url=https://www.washingtonpost.com/lifestyle/style/a-whole-lot-of-history-behind-x-and-o-kiss-and-hug/2014/02/13/0c3e218a-9341-11e3-b46a-5a3d0d2130da_story.html|url-status=live|access-date=2021-03-12|newspaper=[[The Washington Post]]|archive-date=2018-04-01|archive-url=https://web.archive.org/web/20180401143406/https://www.washingtonpost.com/lifestyle/style/a-whole-lot-of-history-behind-x-and-o-kiss-and-hug/2014/02/13/0c3e218a-9341-11e3-b46a-5a3d0d2130da_story.html}}</ref> the earliest example of this usage cited by the ''[[Oxford English Dictionary]]'' is from 1878.<ref>"[https://www.oed.com/view/Entry/230945 X, n.]" ''OED Online'' (Oxford: Oxford University Press, September 2022), §6. Accessed 11 November 2022.</ref>
* An [[X rating]] denotes media, such as movies, that are intended for adults only.
* In the [[Korean language]], a series of Xs is used as a visual [[bleep censor]] for subtitles and captions, serving the same role as an [[asterisk]] (*).<ref>{{Cite web |title='찐따', 'X랄하다'...욕도 전통을 가진다? |trans-title='loser', 'fXing'... swear words also have a tradition? |url=https://www.goeonair.com/news/article.html?no=13845 |url-status=dead |archive-url=https://web.archive.org/web/20240118155129/https://www.goeonair.com/news/article.html?no=13845 |archive-date=18 January 2024 |access-date=2023-08-22 |website=www.goeonair.com |language=ko}}</ref><ref>{{Cite book |last=참바다 |url=https://books.google.com/books?id=XX4WEAAAQBAJ&dq=%EC%9A%95+X&pg=PA6-IA1 |title=시사칼럼 우리 시대의 상징과 은유 |date=2021-01-15 |publisher=e퍼플 |isbn=979-11-6569-712-9 |language=ko}}</ref>
* In the [[C programming language]], "x" preceded by zero (as in 0x or 0X) is used to denote hexadecimal literal values.
* X is commonly used as a prefix term in nouns related to the [[X Window System]] and [[UNIX System V|Unix]].<ref name=":1" />