The term 'REFLEX HAMMER TARGET' refers to a medical tool used in physical examinations. The reflex hammer is a small, handheld device with a rubber head that is used to tap on the KNEE, or other body parts, to test reflexes. The target of the reflex hammer is the KNEE, which is indicated by the four-letter answer to the crossword puzzle. The reflex hammer is used to assess the patient's neurological responses and can help diagnose certain conditions.