左ひだり小しょう括かっ弧こ

Meanings

1

noun

opening parenthesis; left parenthesis

Refers specifically to the left or opening parenthesis symbol ( in Japanese text. Often used in technical or editing contexts.

arc, arch, bow

右みぎ小しょう括かっ弧こ
右小括弧 is the closing parenthesis ), while 左小括弧 is the opening parenthesis (.
括かっ弧こ
括弧 is the general term for parentheses or brackets; 左小括弧 specifies the left small parenthesis.

Compound of 左 (left), 小 (small), and 括弧 (parenthesis). The term transparently describes the left small parenthesis symbol.