N-tuple formed by numbers, letters, or both that is used to determine the position of a point in the coordinate system in a plane, such as a table or Cartesian graph, or in space, such as a polar coordinate system.

In a Cartesian coordinate system of a plane where the coordinates are formed by pairs of numbers, the first element refers to the horizontal position and the second element refers to the vertical position.

In a coordinate system in a plane like the one used on a geographical map or road map; or a game of chess, checkers, or battleship; the coordinates of a square are composed of a letter and a number. In this case, the first coordinate can represent either the vertical position or the horizontal position, and the other coordinate indicates the other position.