noun
double-height size (of text)
Technical term in computing and typography, referring to text that is scaled to twice its normal height while width remains unchanged.
このプリンターは縦倍角印刷に対応している。
This printer supports double-height printing.
倍角 is a broader term for double-width or double-height characters; 縦倍角 specifies the vertical doubling.
Compound of 縦 (vertical) + 倍角 (double-size character). The exact historical derivation is uncertain, but the term is used in modern computing contexts.