Distance and direction is vector.
I believe your asking for the term reffering to an objects change in position from its starting point. That term is displacement.
This term is called displacement.
Displacement includes the distance between the starting and ending points and the direction in which you travel.
It could be a displacement vector.
A circle has no starting or ending point of a circle. Hope this helps!
a line segment
It has the same starting and ending point.