It can be named by number pair.
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It is simply called a point in the coordinate or Cartesian plane.
It is at the point of origin (0, 0) on the Cartesian plane
You do not have 3 coordinates in the Cartesian plane. The Cartesian plane is a plane and is therefore 2 dimensional. In 2 dimensional space you require only 2 coordinates. 3 coordinates are required to locate a point in 3-dimensional space but then it cannot be a Cartesian PLANE.
Any point on the x-axis.
The cartesian coordinates are plotted on the cartesian plane