The term X, Y and Z can be summarized as the three AXES of a 3-dimensional coordinate system. The three AXES are the x-axis, y-axis, and z-axis. The x-axis is typically used to represent the horizontal position of a point, the y-axis is used to represent the vertical position of a point, and the z-axis is used to represent the depth of a point. Together, these three AXES form the basis of a 3-dimensional coordinate system, which is used to describe the location of a point in space.