Viola da braccio is a stringed musical instrument that has been popular since the Renaissance era. The instrument is similar to a violin but is slightly larger and has a deeper, richer sound. Some synonyms for the viola da braccio include the alto violin, the arm violin, and the shoulder violin. These names all refer to the way the instrument is played, as the viola da braccio is held by the player's arm and pressed against the shoulder. Other related instruments include the viola da gamba, which is played in a sitting position, and the viola d'amore, which has sympathetic strings that vibrate along with the main strings.