The term 'body muscle(s)' can refer to two specific muscles in the human body: the DELTOID and the triceps. The DELTOID is a large triangular muscle located at the shoulder, and its name comes from the Greek letter delta, which is shaped like a triangle. The triceps is a three-headed muscle located at the back of the upper arm, and its name comes from the Latin word for 'three-headed'. Both of these muscles are important for movement and stability of the arms and shoulders.