The Crux Gammata. This symbol is also known as the swastika, a name derived from the Sanskrit svastika. As a symbol of prosperity and good fortune, the swastika was widely used in the ancient world. The swastika, known as the Manji in Japanese which moves in a counterclockwise direction stands for Night and Magical practices and is generally considered a solar symbol. It was this version that was perverted by the Nazis and used as their symbol.
I am so getting a manji tattooed on my back!