括号 (kuò hào): parentheses; brackets

When writing an essay, the teacher asked us to put quoted words in parentheses and cite the source.

This math problem requires calculating what's inside the parentheses first, then the multiplication and division outside.

Please fill in your phone number in the form and indicate in the parentheses whether it's a mobile or landline.

When he reads the text aloud, he also reads the notes in parentheses to help classmates understand.