A shield is a protective device used in combat, typically made of wood, metal, or other materials. It is designed to block or deflect attacks, such as arrows or blows from weapons. Shields come in various shapes and sizes, often carried by soldiers or warriors to enhance their defense during battles. In addition to their use in warfare, shields can also serve symbolic purposes. For example, in heraldry, a shield often displays a coat of arms, representing a family or organization. Famous historical shields include the Aegis from Greek mythology and the Roman scutum, both known for their distinctive designs and protective qualities.