Otto with his younger brother Rudolph (appr. 1913)

Invisible or burnt out Sun (or old Sun), symbolizes an opposing force or pole, or the left side of the Universe (or our Galaxy), or the celestial homeland of the Hyperboreans and the invisible source of their energy. The central symbol of the Nazi ideology. The similar term is in alchemy teachings, Mayan mythology, Helena Blavatsky's Theosophy (Central Sun) etc.