There are numerous symbols.
d(A,B), |AB|, AB are some symbols for the distance between points A and B. The Greek letter Delta can also be used in place of d in the first example.
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math
We generally use the term perimeter to describe the distance around a geometric figure.
Two vertical lines, next to each other.
It is called postion and it is represented as a circle with a plus sign in it. For the symbol representations GOOGLE: Geometric Tolerancing Symols.
The metric of a geometric space is defined as the distance between two points.