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One. Because a ray starts with a fixed point and endlessly extends on the opposite side. Thus there is only one endpoint.
A ray has one origin point and no end points. If it had an end point it would be a line.
A geometrical ray has one point and the other side extends infinitely in one direction.
It is because many things are measured with reference to a fixed point: it space or time. This point is called a reference point or origin.
A ray has only one end point.