\langle \rangleAngle brackets are used as delimiters in mathematical expressions, often to denote inner products, sequences, or tuples.
Denotes an inner product of vectors x and y.
\langle x, y \rangleRepresents a sequence of elements indexed by n.
\langle a_n \rangleRepresents a tuple containing the elements 1, 2, and 3.
\langle 1, 2, 3 \rangle