square bracket

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Definitions from WordNet

Noun square bracket has 1 sense

bracket, square bracket - either of two punctuation marks ([ or ]) used to enclose textual material
--₁ is a kind of punctuation, punctuation mark

Definitions from the Web

Square Bracket

A square bracket is a punctuation mark consisting of two straight vertical lines used in writing or coding to indicate a separate section or to enclose additional information.

Usage Examples:

In coding, square brackets are commonly used to access elements in an array: myArray[0].
When citing a source, you can add additional information within square brackets to clarify or provide context: "The statement was [made in 2021]."
In music notation, square brackets indicate optional or alternate sections or notes.
Some programming languages use square brackets to define character classes in regular expressions.

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