The black sun (German: Schwarze Sonne) is a symbol employed in a post-Third Reich context by neo-Nazis and some occult subcultures, such as Satanism. The symbol first occurs as a design element in a castle remodeled and expanded under Heinrich Himmler during the Nazi era. The symbol's design consists of twelve radial mirrored sig runes, symbols employed as a logo by the Schutzstaffel.