Cartesian coordinate system
In mathematics and geometry, the Cartesian coordinate system is a coordinate system used to give the location of points on a plane by using two numbers for each point. It is also called the rectangular coordinate system. The numbers are usually called the  coordinate and the  coordinate or sometimes the abscissa and ordinate. To find the coordinates of a point, two perpendicular lines, called axes (singular: axis), are drawn. The point where the axes meet is the coordinate origin, written (0,0). The  coordinate gives the position of a point measured along the  axis, and the  coordinate gives the position along the  axis.