Math symbol brackets

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