Either of a pair of parentheses.
- ‘The decision whether matter should be between commas, round brackets, or dashes is made by author or editor, and may be a matter of personal, editorial, or house style.’
- ‘Where further information is available, a number in square or round brackets is used to direct the reader to an article in the list of references.’
- ‘The arrays, as far as I'm aware still use round brackets.’
- ‘The results of logit and probit estimation for the first analysis are shown in Table 3 (with p values reported in round brackets and z values in square brackets).’