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Noun edit

square bracket (plural square brackets)

  1. Either of a pair of symbols, [ ], used for various purposes, e.g. to enclose text inserted or replaced by an editor, and to indicate various mathematical operations.
    • 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 square bracket is the most convenient. Hence [a + ] x denotes that a + operates on x, and [φ]n denotes that φ operates on itself n - 1 times.

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