For Coordinates (Positional) we have a term and definition in Real Time 3D.

Coords for short, these are the numbers that tell the engine where to position things, whether in 3D or in 2D (like a polygon or an overlay). If positioning something in 3D, you need three coords, commonly called X, Y, and Z, and usually written as (X,Y,Z). If positioning something in 2D, you only use the X and the Y, and write it as (X,Y). For 2D, the X is horizontal, the Y is vertical, and the numbers usually start at (0,0) in the upper-left corner. But for 3D, Y is not always vertical-- see Cartesian coordinates.
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