noun
writing in parentheses; parenthetical notation
Refers to the act of writing something inside parentheses or brackets, or the resulting text.
説明を括弧書きで補足する。
Supplement the explanation with a note in parentheses.
この書類では、日付は括弧書きで示されている。
In this document, dates are shown in parentheses.
括弧 means 'parentheses' or 'brackets' themselves, while 括弧書き refers to the act of writing inside them or the resulting text.
Compound of 括弧 (parentheses) and 書き (writing), from 書く (to write).