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Definition of Square bracket
1. Noun. Either of two punctuation marks ([ or ]) used to enclose textual material.
Definition of Square bracket
1. Noun. Either of a pair of symbols, (unsupported [) (unsupported ]), 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. ¹
¹ Source: wiktionary.com