Where does “角括弧” come from?

角括弧 (Japanese) comes from Japanese 角, from Middle Chinese 角.

角括弧 (Japanese): a square bracket

Definitions

  1. a square bracket

Ancestry of “角括弧”, step by step

角括弧 traces back through two separate lines of ancestry.

via Japanese 角

StepLanguageWordMeaning
1Japanese角A corner; An edge; A street corner
2Middle Chinese角—

via Japanese 括弧

StepLanguageWordMeaning
1Japanese括弧a parenthesis; a bracket either of a pair of brackets
Every word from Middle Chinese 角 →Every word from Japanese 角 →