Jisho

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Noun
1. half-width kana
Wikipedia definition
2. Half-width kanaare katakana characters displayed at half their normal width, instead of the usual square aspect ratio. For example, the usual (full-width) form of the katakana ka is カ while the half-width form is カ. There are no half-width hiragana or kanji. Half-width kana were used in the early days of Japanese computing, to allow Japanese characters to be displayed on the same grid as monospaced fonts of Latin characters. Half-width hiragana or kanji were not used.
Read “Half-width kana” on English Wikipedia
Read “半角カナ” on Japanese Wikipedia
Read “Half-width kana” on DBpedia

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