The term "radial side" refers to the side of the forearm that is aligned with the radius bone, which is one of the two long bones in the forearm. This side is located on the thumb side of the arm when the palm is facing upward. It plays a crucial role in the movement and function of the wrist and hand. In anatomy, the radial side is often contrasted with the "ulnar side," which is associated with the ulna bone and is located on the little finger side of the forearm. Understanding the radial side is important in fields such as orthopedics and physical therapy, where knowledge of arm anatomy aids in diagnosing and treating injuries.