An arm ring, also known as an armlet or an armband, is a band of metal, usually a precious metal, worn as a jewelry or an ornament around the biceps of the upper arm.The arm ring is similar to a bracelet or bangle, though it must be shaped and sized to fit snugly to the upper arm.Historically, the arm ring was commonly worn by men, and often a ring in bronze age heroic literature would refer to an arm ring, rather than a finger ring.n arm ring, also known as an armlet or an armband, is a band of metal, usually a precious metal, worn as a jewelry or an ornament around the biceps of the upper arm.