Black Sun patch
This embroidered patch is three inches in diameter.

The Black Sun, also known as the sonnenrad (sun wheel) in German, specifically comes from the floor of the north tower of Wewelsburg Castle, which was renovated by SS-leader Heinrich Himmler. The castle was a meeting place of only highest members of the SS, and Himmler considered it the axis mundi (center of the world) for their ideology.