A number line or, in 2 or more dimensions a grid.
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However unsure as I may be sir/ma'am, I believe the answer is a scale.
It is the locus of a point such that the sum of its distance from two (distinct) fixed points is a constant. So, given two fixed points, F1 and F2, an ellipse is the locus of the point P such that PF1 + PF2 is a constant. That would be an ellipsoid, a 3 dimensional thing. The 2 distances have to be measured in a fixed (2 dimensional) plane.
One definition is that it is the locus of a point such that the sum of its distances from two fixed points (the foci) is a constant. There are several equivalent forms in coordinate geometry. Once the ellipse has been centred on the orign (using translations), (x/a)2 + (y/b)2 = 1 or x2 + (ey)2 = c2
A fixed-point number representation displays numbers with a fixed number of decimal places. This means that the number will always have the same number of digits after the decimal point, regardless of the value of the number itself.
It is a fixed reference point in space from which distances are measured.