That is the national symbol for the Isle. For centuries, the island's symbol has been the so-called "three legs of Mann" (Manx: Tree Cassyn Vannin), a triskelion of three legs conjoined at the thigh. The Manx triskelion, which dates with certainty to the late 13th century, is of an uncertain origin. It has been suggested that its origin lies in Sicily, an island which has been associated with triskelions since ancient times. Another possibility is that its origin lies with the emblem of the 10th century Norse-Gaelic dynasty which ruled the island at the time. The symbol appears in the island's official flag and official coat of arms, as well as its currency.