then it is not a line it is a ray. line go on and on without stopping in both directions.
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That type of line would be called a ray.
Either one of the endpoints will work. The other endpoint is the end.
A line with a dot at one end and an arrow at the other end is called a ray in geometry. A ray has a starting point (the dot) and extends infinitely in one direction (towards the arrow). It is often denoted by naming the starting point and any other point on the ray, such as "ray AB" if A is the starting point and B is another point on the ray. Rays are commonly used in geometric constructions and proofs.
end point
a line segment