Halfwidth and fullwidth forms

For the Unicode block, see Halfwidth and Fullwidth Forms (Unicode block).
A command prompt (cmd.exe) with Korean localisation, showing halfwidth and fullwidth characters

In CJK (Chinese, Japanese, and Korean) computing, graphic characters are traditionally classed into fullwidth[a] and halfwidth[b] 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+FF00–FFEF, provided so that older encodings containing both halfwidth and fullwidth characters can have lossless translation to and from Unicode.
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