Delimiters symbol
\lang \rangThe \lang \rang delimiters are used to denote angle brackets, which are often used in mathematical expressions to represent inner products, sequences, or tuples.
Inner product of vectors x and y
\lang x, y \rangSequence or tuple of elements a_1 to a_n
\lang a_1, a_2, \ldots, a_n \rangBra-ket notation in quantum mechanics, representing the inner product of u and v
\lang u | v \rang