- Either of a pair of symbols, , used for various purposes, e.g. to enclose text inserted or replaced by an editor, to indicate various mathematical operations, and to indicate a link in MediaWiki? syntax.
- 1905, Royal Irish Academy, Proceedings of the Royal Irish Academy, page 33:
- : We must, in short, employ a special bracket for operative relations ; and the is the most convenient. Hence a + bÎ² x denotes that a + bÎ² operates on x, and Ï†n denotes that Ï† operates on itself n - 1 times.
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