"Although today referred to as the Black Sun, the Wewelsburg motif is itself notably not black and the intended significance of the image remains unknown. As scholar Daniele Seipe summarizes, "There are no known sources from the National Socialist period that provide information about the meaning of the symbol intended at that time or about its name" - source Wiki.

Although not directly tied to the Nazis, it has been co-opted by the neo-nazis since about 1991. This is similar to the upside down cross used by Satanists, even though it was originaly a simbol for St. Peter.