Parentheses in mathematical equations () may refer to: Precedence of operators Interval Matrix Arguments in mathematical functions. For example, f(x) is the function f applied to the variable x. A set of coordinates in a coordinate system. For example (4,7) may represent the point located at 4 on the x-axis and 7 on the y-axis. More generally, a tuple. The greatest common divisor of two numbers x and y, sometimes written with the notation (x,y). An inner product Equivalence class congruence, especially for modular arithmetic or modulo an ideal, e.g. as or . A higher order derivative in Lagrange's notation. A Binomial coefficient or multinomial coefficient. A Legendre symbol, Jacobi symbol or Pochhammer symbol.