The locus of a point in a direction from a position in a plane is called a ray.
A ray is a one directional straight line. It is actually formed by a point which starts from a position on a plane and continues its traveling infinitely in a direction. It seems, it is half of the straight line.
A special mathematical representation is used to denote a ray in mathematics and it is developed as per the geometric formation of the ray.
In this example, $R$ is a starting point $S$ is any point on the straight path. Write the names of them as $RS$ and display a right arrow symbol over names of both points.
Therefore, $\overrightarrow{RS}$ is the mathematical representation of a ray. Thus, any ray can be denoted mathematically in this manner.
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