Answer
ray $\overrightarrow{ST}$
Work Step by Step
$\overrightarrow{ST}$ is a ray because it has only one fixed endpoint while continuing indefinitely in the opposite direction.
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.