Question

what is the name of this figure?
figure with a red line, point a (with an arrow to the left) and point b
blue buttons and a save answer box

Explanation:

This figure has two endpoints (A and B) with one end extending infinitely in a single direction, which matches the definition of a ray. The notation for a ray starts at the endpoint and points to the direction of extension, so it is written with a single arrow over the two points, starting at the fixed endpoint.

Answer:

$\overrightarrow{BA}$ (Ray BA)