Reference

In general, a reference is something that refers or points to something else, or acts as a connection or a link between two things. The objects it links may be concrete, such as books or locations, or abstract, such as data, thoughts, or memories.

Geometry

A reference point is a location used to describe another one, by giving the relative position.

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Similarly we have the concept of frame of reference (both in physics and figuratively), etc.

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