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|note = <ref>{{cite web|url=https://www.unicode.org/versions/Unicode1.0.0/Notice.pdf|title=Unicode 1.0.1 Addendum|work=The Unicode Standard|date=1992-11-03|access-date=2016-07-09
▲|note = <ref>{{cite web|url=https://www.unicode.org/versions/Unicode1.0.0/Notice.pdf|title=Unicode 1.0.1 Addendum|work=The Unicode Standard|date=1992-11-03|access-date=2016-07-09|url-status=live|archive-url=https://web.archive.org/web/20160702004420/http://www.unicode.org/versions/Unicode1.0.0/Notice.pdf|archive-date=2016-07-02}}</ref><ref>{{cite web|url=https://www.unicode.org|title=Unicode character database|work=The Unicode Standard|access-date=2016-07-09|url-status=live|archive-url=https://web.archive.org/web/20160710080729/http://www.unicode.org/|archive-date=2016-07-10}}</ref><ref>{{cite web|url=https://www.unicode.org/versions/enumeratedversions.html|title=Enumerated Versions of The Unicode Standard|work=The Unicode Standard|access-date=2016-07-09|url-status=live|archive-url=https://web.archive.org/web/20160629001311/http://www.unicode.org/versions/enumeratedversions.html|archive-date=2016-06-29}}</ref>
}}
'''Halfwidth and Fullwidth Forms''' is
Range U+FF01–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]]".
Range U+FF61–FF9F encodes halfwidth forms of [[katakana]] and related punctuation in a transposition of A1 to DF in the [[JIS X 0201]] encoding – see [[half-width kana]].
The range U+FFA0–FFDC encodes halfwidth forms of [[Hangul Compatibility Jamo|compatibility jamo]] characters for [[Hangul]], in a transposition of their [[KS C 5601#1974|1974 standard]] layout. It is used in the mapping of some IBM encodings for Korean, such as IBM code page 933, which allows the use of the [[Shift Out and Shift In characters]] to shift to a double-byte character set.<ref name="ibm933">{{cite web|url=http://demo.icu-project.org/icu-bin/convexp?conv=ibm-933|title=ICU Demonstration - Converter Explorer|website=demo.icu-project.org|access-date=7 May 2018}}</ref> Since the double-byte character set could contain compatibility jamo, halfwidth variants are needed to provide round-trip compatibility.<ref name=hwfwblame>{{Cite web|url=https://harjit.moe/hwfwblame.html|title=Halfwidth and Fullwidth blame}}</ref><ref>{{Cite web|url=http://userguide.icu-project.org/conversion/data|title=Conversion Data - Old ___location of the ICU User Guide}}</ref>
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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|０︀}}).<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]] ID !! [[ISO/IEC JTC 1/SC 2|WG2]] 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.}}
|-
| {{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
|-
| {{nobr|[https://www.unicode.org/L2/L2019/19008.htm L2/19-008]}} || || {{Citation|title=UTC #158 Minutes
|-
| 1.1 |
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| rowspan="11" | 3.2 || rowspan="11
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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" | {{
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