かっこ括弧kakkoカッコkakko
1.

A symbol used in writing to enclose words, phrases, or numbers to indicate that they are a unit or to clarify meaning, often appearing as () or [].

2.

A punctuation mark that helps to organize or separate content in a sentence, serving to highlight or add information without interrupting the main flow.

Example:

カッコ内の言葉を短縮形にしなさい。