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

Revision as of 08:44, 1 March 2022

Revision as of 12:50, 22 March 2022

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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 reletedrelated punctuation in a transposition of A1 to DF in the [[JIS X 0201]] encoding – see [[half-width kana]].

The range U+FFA0&ndash;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>