Pronator means that the muscle will be doing pronation movement. The pronation movement could happen in the hands and feet. The word teres saying that its shape is round. The name doesn't contain a hint about the number(like bi-ceps or tri-ceps) or the location(like palmar or plantar).
The pronator teres is a muscle which is located in the forearm of the human beings. The other muscles found in combination with this pronator quadratus.
This muscle has two heads- ulnar and humeral. The humeral heads of the muscle are large and more superficial.
The ulnar region is thin fasciculus which originates from the medial side of the coronoid process of ulna.