Shoulder boards are decorative insignia worn on the shoulders of military uniforms, indicating a person's rank and branch of service. They are typically made of fabric or metal and feature various designs, colors, and symbols that represent different ranks within the military hierarchy. In addition to the military, shoulder boards are also used in other organizations, such as law enforcement and certain civilian uniforms. Their primary purpose is to provide a quick visual reference for rank and authority, helping to maintain order and structure within the organization.