noun
double-width character; double-size character
Computing term for a character that occupies twice the normal width and/or height, often used in text formatting or display settings.
このソフトでは、倍角文字を使ってタイトルを強調できます。
In this software, you can emphasize titles using double-width characters.
倍角文字は、通常の文字の2倍の幅で表示されます。
Double-width characters are displayed at twice the width of normal characters.
Compound of 倍 (double) + 角 (square, here referring to the em-square of a character) + 文字 (character). The term is a technical coinage from computing.