square brackets to denote the ceiling function, as in . However, the floor and ceiling functions are usually typeset with left and right square brackets where only the lower (for floor function) or upper (for ceiling function) horizontal bars are displayed, as in or . Braces, as in , may denote the fractional part of a real number. See also Binomial coefficient Bracket polynomial Bra-ket notation Delimiter Dyck language Frölicher–Nijenhuis bracket Iverson bracket Nijenhuis–Richardson bracket, also known as algebraic bracket. Pochhammer symbol Poisson bracket Schouten–Nijenhuis bracket Notes Arithmetic Mathematical notation