Un claudàtor o clau quadrada o parèntesi quadrat és un signe de puntuació doble [ ] que es col·loca envoltant un text numèric, alfanumèric o signes de puntuació.
In mathematics, brackets of various typographical forms, such as parentheses, square brackets [ ], braces { } and angle brackets ⟨ ⟩, are frequently used in mathematical notation.
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