The two letters for a 2-dimensional plane are X and Y. Each one is known as an axis, therefore being the X axis and the Y axis. The X axis is the horizontal dimension and the Y axis is the vertical dimension.
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Coordinate Plane
Rene Descartes
The coordinate plane is sometimes call the Cartesian plane because Rene Descartes is often credited with inventing the coordinate plane and so the coordinate plane is sometimes called the Cartesian plane,in his honor.
A coordinate is a specific point on a plane, usually dictated by two sets of numbers.
The Rectangular Coordinate Plane