Halfwidth and fullwidth forms
Alternative width characters in East Asian typography / From Wikipedia, the free encyclopedia
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For the Unicode block, see Halfwidth and Fullwidth Forms (Unicode block).
In CJK (Chinese, Japanese, and Korean) computing, graphic characters are traditionally classed into fullwidth[lower-alpha 1] and halfwidth[lower-alpha 2] characters. Unlike monospaced fonts, a halfwidth character occupies half the width of a fullwidth character, hence the name.
Halfwidth and Fullwidth Forms is also the name of a Unicode block U+FF00āFFEF, provided so that older encodings containing both halfwidth and fullwidth characters can have lossless translation to and from Unicode.