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Question: What is an Origin ?

Answer:

An origin is a starting point. It is the zero mark on a number line, or the point where coordinate axes cross.

In Geometry, the origin of a Euclidean space is a special point, usually denoted by the letter O, used as a fixed point of reference for the geometry of the surrounding space.

In two dimensions it is the point with coordinates (0,0) and in three dimensions it is the point with coordinates (0,0,0).