The arm joint is an essential part of the human body that enables us to move our arms. There are several synonyms for the term "arm joint." Some of the most common synonyms for arm joint are shoulder joint, elbow joint, and wrist joint. The shoulder joint is the uppermost joint in the arm, which connects the arm to the torso. The elbow joint is the middle joint in the arm and is responsible for the bending and straightening of the arm. The wrist joint is the joint that connects the hand to the forearm. Each of these joints plays a crucial role in enabling us to carry out various activities that require the use of our arms.