Editing 7 (section)

==Evolution of the Arabic digit==
{{More citations needed section|date=May 2024}}
[[File:SevenGlyph.svg|x50px|left]]
For early [[Brahmi numerals]], 7 was written more or less in one stroke as a curve that looks like an uppercase {{angbr|J}} vertically inverted (ᒉ). The western Arab peoples' main contribution was to make the longer line diagonal rather than straight, though they showed some tendencies to making the digit more rectilinear. The eastern Arab peoples developed the digit from a form that looked something like 6 to one that looked like an uppercase V. Both modern Arab forms influenced the European form, a two-stroke form consisting of a horizontal upper stroke joined at its right to a stroke going down to the bottom left corner, a line that is slightly curved in some font variants. As is the case with the European digit, the [[Cham script#Numerals|Cham]] and [[Khmer script#Numerals|Khmer digit]] for 7 also evolved to look like their digit 1, though in a different way, so they were also concerned with making their 7 more different. For the Khmer this often involved adding a horizontal line to the top of the digit.<ref>Georges Ifrah, ''The Universal History of Numbers: From Prehistory to the Invention of the Computer'' transl. David Bellos et al. London: The Harvill Press (1998): 395, Fig. 24.67</ref> This is analogous to the horizontal stroke through the middle that is sometimes used in [[handwriting]] in the Western world but which is almost never used in [[computer fonts]]. This horizontal stroke is, however, important to distinguish the glyph for seven from the glyph for [[1 (number)|one]] in writing that uses a long upstroke in the glyph for 1. In some Greek dialects of the early 12th&nbsp;century the longer line diagonal was drawn in a rather semicircular transverse line. 
[[File:Digital77.svg|left|x50px]]
On [[seven-segment display]]s, 7 is the digit with the most common graphic variation (1, 6 and 9 also have variant glyphs). Most devices use three line segments, but devices made by some Japanese companies such as [[Sharp Corporation|Sharp]] and [[Casio]], as well as in the Koreas and Taiwan, 7 is written with four line segments because in those countries, 7 is written with a "hook" on the left, as ① in the following illustration. Further segments can give further variation. For example, [[Schindler Group|Schindler]] elevators in the United States and Canada installed or modernized from the late 1990s onwards usually use a sixteen segment display and show the digit 7 in a manner more similar to that of handwriting.
[[File:sevens.svg|left|x50px]]
While the shape of the character for the digit 7 has an [[ascender (typography)|ascender]] in most modern [[typeface]]s, in typefaces with [[text figures]] the character usually has a [[descender]], as, for example, in [[File:TextFigs078.svg|40px]].

[[File:Hand Written 7.svg|left|x50px]]Most people in Continental Europe,<ref>{{Cite journal |title=Aamulehti: Opetushallitus harkitsee numero 7 viivan palauttamista |author=Eeva Törmänen |date=September 8, 2011 |journal=Tekniikka & Talous |url=http://www.tekniikkatalous.fi/viihde/aamulehti+opetushallitus+harkitsee+numero+7+viivan+palauttamista/a682831 |language=fi |access-date=September 9, 2011 |archive-url=https://web.archive.org/web/20110917083226/http://www.tekniikkatalous.fi/viihde/aamulehti+opetushallitus+harkitsee+numero+7+viivan+palauttamista/a682831 |archive-date=September 17, 2011 |url-status=dead }}</ref> Indonesia,{{citation needed|date=April 2024}} and some in Britain, Ireland, Israel, Canada, and Latin America, write 7 with a line through the middle ({{strikethrough|7}}), sometimes with the top line crooked. The line through the middle is useful to clearly differentiate that digit from the digit ''one'', as they can appear similar when written in certain styles of handwriting. This form is used in official handwriting rules for [[primary school]] in Russia, Ukraine, Bulgaria, Poland, other Slavic countries,<ref>[http://www.adu.by/modules.php?name=News&file=article&sid=858 "Education writing numerals in grade 1."] {{webarchive|url=https://web.archive.org/web/20081002092040/http://www.adu.by/modules.php?name=News&file=article&sid=858 |date=2008-10-02 }}(Russian)</ref> France,<ref>[http://www.pour-enfants.fr/jeux-imprimer/apprendre/les-chiffres/ecrire-les-chiffres.png "Example of teaching materials for pre-schoolers"](French)</ref> Italy, Belgium, the Netherlands, Finland,<ref>{{Cite journal |title="Nenosen seiska" teki paluun: Tiesitkö, mistä poikkiviiva on peräisin? |author=Elli Harju |date=August 6, 2015 |journal=Iltalehti |url=https://www.iltalehti.fi/uutiset/a/2015080620139397 |language=fi}}</ref> Romania, Germany, Greece,<ref>{{cite web |url=http://ebooks.edu.gr/modules/document/file.php/DSDIM-A102/%CE%94%CE%B9%CE%B4%CE%B1%CE%BA%CF%84%CE%B9%CE%BA%CF%8C%20%CE%A0%CE%B1%CE%BA%CE%AD%CF%84%CE%BF/%CE%92%CE%B9%CE%B2%CE%BB%CE%AF%CE%BF%20%CE%9C%CE%B1%CE%B8%CE%B7%CF%84%CE%AE/10-0007-02_Mathimatika_A-Dim_BM-1.pdf |title=Μαθηματικά Α' Δημοτικού |language=el |trans-title=Mathematics for the First Grade |publisher=Ministry of Education, Research, and Religions |access-date=May 7, 2018 |page=33}}</ref> and Hungary.{{citation needed|date=September 2021}}