半はん角かく数すう字じ

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Meanings

1

noun

half-width digit

Technical term used in computing and typography to refer to digits that occupy half the width of a full-width character, such as ASCII digits (0-9).

half, middle, odd number

角angle, corner, square

数number, strength, fate

字character, letter, word

全ぜん角かく数すう字じ
Refers to full-width digits (０-９), which occupy the same width as a CJK character, as opposed to half-width digits.
半はん角かく英えい数すう字じ
Both half-width alphabetic characters and digits, whereas 半角数字 refers only to digits are also used.

Compound of 半角 (half-width) and 数字 (digit). The term is a modern technical coinage from computing and typography.