The subclavian vein is a major blood vessel that is located in the upper region of the body. There are several synonyms for this important vein, including the subclavian artery, the venae comitantes, and the supraclavicular vein. Each of these terms refers to the same anatomical structure, which carries deoxygenated blood from the upper limbs and thorax to the heart. The subclavian vein is a critical component of the circulatory system, and any disruptions to its function can have serious implications for a person's health. Familiarity with the synonyms for this term can help healthcare professionals communicate effectively about the physiology of the human body.