If you mean a straight path, rather than a strait path, then it is a ray.
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If you are talking about line segment-type objects, it would be a ray.
A ray has one point and one that goes on forever, a line segment has two points.
A ray is a line that begins at a point and goes away from it forever and ever.If two of these rays share the same starting point, it is called a vertex.What figure would look like a point with 2 rays going in different directions be called?You're looking at an angle.
A Ray
Ray, it has a stop/start point (the flashlight), and it goes on "forever."