亀甲括弧きっこうかっこ

noun

tortoiseshell bracket

A punctuation mark shaped like a tortoiseshell, used in Japanese typography. The symbol is 〔 〕.

• 亀甲きっこう括かっ弧こは文ぶん章しょう中ちゅうで注ちゅう記きなどに使つかわれます。

  Tortoiseshell brackets are used for notes and similar material in text.