The artery you feel when taking the pulse at the wrist (the most common spot people mean) is the radial artery.

If you meant a different place that starts with “th…” (for example, throat/neck), that pulse is felt over the carotid artery on either side of the trachea.

To make sure I match what you need: were you asking about the pulse at the wrist or the one at the side of the neck?