benchmark number
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The coordinate of that number.
It is the number that represents the distance of the point from the origin, or zero. It may be called the coordinate.
The position of the particle can be given by a number representing the distance of the particle from some fixed reference point (called the origin). This is not enough to describe the motion of the particle since for that you also required the time (or times) at which the particle is at any particular point.
origin
Decimal point