Halfwidth and Fullwidth Forms (Unicode block): Difference between revisions

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'''Halfwidth and Fullwidth Forms''' is the name of a [[Unicode block]] U+FF00&ndash;FFEF, provided so that older encodings containing both [[Halfwidth and fullwidth forms|halfwidth and fullwidth]] characters can have lossless translation to/from Unicode. It is the second-to-last block of the [[Basic Multilingual Plane]], followed only by the short [[Specials (Unicode block)|Specials]] block at U+FFF0&ndash;FFFF. Its block name in Unicode 1.0 was '''Halfwidth and Fullwidth Variants'''.<ref>{{cite web |url=https://www.unicode.org/versions/Unicode1.0.0/CodeCharts2.pdf |work=The Unicode Standard |version=version 1.0 |title=3.8: Block-by-Block Charts |publisher=[[Unicode Consortium]]}}</ref>

Range U+FF01&ndash;FF5E reproduces the characters of [[ASCII]] 21 to 7E as fullwidth forms. U+FF00 does not correspond to a fullwidth ASCII 20 (space character), since that role is already fulfilled by U+3000 "[[ideographic space]]".

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An additional variant is defined for a fullwidth [[slashed zero|zero with a short diagonal stroke]]: U+FF10 FULLWIDTH DIGIT ZERO, U+FE00 VS1 ({{not a typo|０&#xfe00;}}).<ref>{{cite web|url=https://www.unicode.org/L2/L2015/15268-slashed-zero.pdf|title=L2/15-268: Proposal to Represent the Slashed Zero Variant of Empty Set|date=2015-10-30|first1=Barbara|last1=Beeton|first2=Asmus|last2=Freytag|first3=Laurențiu|last3=Iancu|first4=Murray|last4=Sargent}}</ref><ref name="stdvar"/>

==History==

The following Unicode-related documents record the purpose and process of defining specific characters in the Halfwidth and Fullwidth Forms block:

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! [[Unicode#Versions|Version]] !! {{nobr|Final code points<ref group=lower-alpha name=final/>}} !! Count !! [[International Committee for Information Technology Standards|L2]]&nbsp;ID !! [[ISO/IEC JTC 1/SC 2|WG2]]&nbsp;ID !! Document

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| {{nobr|[https://www.unicode.org/L2/L2018/18115.htm L2/18-115]}} || || {{Citation|title=UTC #155 Minutes|date=2018-05-09|first=Lisa|last=Moore|section=Consensus 154-C17|quote=Add 16 standardized variation sequences based on L2/17-436R, for Unicode 12.0.}}

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| {{nobr|[https://www.unicode.org/L2/L2019/19055-segment-fullwd-digits.txt L2/19-055]}} || || {{Citation|title=Proposed Changes in the Segmentation Property Values for Fullwidth Digits |date=2019-01-14|first=Laurențiu|last=Iancu}}

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| {{nobr|[https://www.unicode.org/L2/L2019/19008.htm L2/19-008]}} || || {{Citation|title=UTC #158 Minutes |date=2019-02-08|first=Lisa|last=Moore|section=B.11.11.1.2 Proposed changes in the segmentation property values for fullwidth digits}}

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| 1.1 || width="180" | U+FFE8..FFEE || 7 || || || (to be determined)

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| rowspan="11" | 3.2 || rowspan="11" width="180" | U+FF5F..FF60 || rowspan="11" | 2 || {{nobr|[https://www.unicode.org/L2/L1999/99052.htm L2/99-052]}} || || {{Citation|title=The math pieces from the symbol font|date=1999-02-05|first=Asmus|last=Freytag}}

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| {{nobr|[https://www.unicode.org/L2/L2001/01033-addbrackets.htm L2/01-033]}} || || {{Citation|title=Disunify braces/brackets for math, computing science, and Z notation from similar-looking CJK braces/brackets|date=2001-01-16|first1=Kent|last1=Karlsson|first2=Asmus|last2=Freytag}}

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| {{nobr|[https://www.unicode.org/L2/L2002/02154-n2403-minutes.pdf L2/02-154]}} || [https://www.unicode.org/wg2/docs/n2403.pdf N2403] || {{Citation|title=Draft minutes of WG 2 meeting 41, Hotel Phoenix, Singapore, 2001-10-15/19|date=2002-04-22|first=V. S.|last=Umamaheswaran|section=Resolution M41.1}}

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| colspan="6" | {{Reflistreflist|group=lower-alpha|refs=<ref name=final>Proposed code points and characters names may differ from final code points and names</ref>}}

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