横よこ倍ばい角かく

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Meanings

1

noun

double-width size (of text)

computing

Computing term referring to text or characters that are twice the normal width, often used in word processing or typesetting.

横sideways, side, horizontal

倍double, twice, times

角angle, corner, square

倍ばい角かく
倍角 is a broader term for double-width or double-height characters; 横倍角 specifically refers to double-width (horizontal) only.
縦たて倍ばい角かく
縦倍角 is the counterpart for double-height characters, whereas 横倍角 is for double-width.

Compound of 横 (horizontal) + 倍角 (double size), a technical term from computing and typesetting.