Brackets as a mathematical symbol may refer to:
Parentheses "()" Argument of a function in mathematical functions A set of coordinates in a coordinate system Tuple, a sequence of elements The greatest common divisor of two numbers Equivalence class congruence, especially for modular arithmetic or modulo an ideal A higher order derivative in Lagrange's notation Binomial or multinomial coefficient
Square brackets "[]" Commutator, an indicator to which a binary operation fails to be commutative Iverson bracket, notation Lie bracket of vector fields, operator
Chevrons "〈〉" Dirac notation, in quantum mechanics Moment, measures relating to the shape of a function's graph Linear span, a set of all linear combinations of vectors Mean, mean of a set of values (e.g.〈x〉= (x1 + ... + xn) / n)
Other uses Order of operations, uses multiple types of brackets Set, uses braces "{}" Interval, uses square brackets and parentheses Matrix, uses square brackets and parentheses Inner product space, uses parentheses and chevrons
See also Glossary of mathematical symbols