In math, it is called the origin
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(0,0) = the origin
A strange question.... but basically you are referring to the origin. The coordinates of the origin are (0,0) because you have not moved away from the origin in either the x or the y direction.
It is the real number whose length represents the distance from the zero on the line to the point on the line.
When the object, whose location is being measured, is at the reference point for measuring displacement.