One. Because a ray starts with a fixed point and endlessly extends on the opposite side. Thus there is only one endpoint.
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A ray has one origin point and no end points. If it had an end point it would be a line.
ray
a ray is a line with one end point and the other side goes on forever. if it had two end points it would be a line segment
A segment has two end points. If a line has one end point, then it must be called ray.
A ray has a single start point, and goes on infinitely in one direction. A line segment has two end points and is finite. A line has no end points and goes on infinitely in two directions.