Many of these institutions have begun to employ blazons representing modern objects unknown in the medieval world. For example, some heraldic symbols issued by the United States Army Institute of Heraldry incorporate symbols such as guns, airplanes, or locomotives. Some scientific institutions incorporate symbols of modern science such as the atom or particular scientific instruments. The arms of the United Kingdom Atomic Energy Authority uses traditional heraldic symbols to depict the harnessing of atomic power. Locations with strong associations to particular industries may incorporate associated symbols. The coat of arms of Stenungsund Municipality in Sweden, pictured right, incorporates a hydrocarbon molecule, alluding to the historical significance of the petrochemical industry in the region.