Jisho

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全角半角
Wikipedia definition
1. Halfwidth and fullwidth formsIn CJK (Chinese, Japanese and Korean) computing, graphic characters are traditionally classed into fullwidth and halfwidth characters. With fixed-width fonts, a halfwidth character occupies half the width of a fullwidth character, hence the name. In the days of computer terminals and text mode computing, characters were normally laid out in a grid, often 80 columns by 24 or 25 lines.
Read “Halfwidth and fullwidth forms” on English Wikipedia
Read “全角と半角” on Japanese Wikipedia
Read “Halfwidth and fullwidth forms” on DBpedia

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