The point where the value is 0.
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It is the starting point for the number line, also called the origin. Measurements, along the number line, for all other values, are taken from that point.
Somewhere on the line, at a distance that is A times the unit distance from the origin.
It is the distance from the origin to the number in question.
It is the number that represents the distance of the point from the origin, or zero. It may be called the coordinate.
this is also called the origin on that line. it is the point equidistant between -1 and +1.