noun which may take the genitive case particle 'no', noun
in parentheses; in brackets; parenthesized; bracketed
Refers to content placed inside parentheses or brackets. Used as a noun or with の to modify another noun.
括弧内の数字は前年比を示す。
The figures in parentheses show the year-on-year change.
カッコ内に適切な語を入れなさい。
Fill in the parentheses with the appropriate word.
括弧 means 'parentheses' or 'brackets' themselves, while 括弧内 refers to the content inside them.
Compound of 括弧 (parentheses/brackets) + 内 (inside).