An open ray is a one-dimensional shape with no boundary that stretches infinitely in one direction, but stops in another direction. This means that it is the set of points in the real line that are not enclosed by a ray. It can alternately be thought of as a ray but with the point at the end removed, or as a number line containing all positive, nonzero finite numbers. Because it is unbounded, it is topologically equivalent to the Euclidean line.