The Triskele, or triquetra is a symmetrical triple spiral design. It is a symbol with a long pre-celtic history, versions of which are used today (try a search for the symbol of Sicily, or for the symbol of the U.S. Department of Transportation.). Versions of the symbol have been found in prehistoric rock from long before the arrival of Celts in Ireland. Much like the Trinity, in Celtic Christianity the triskele took on the meaning of Father, Son, and Holy Spirit. While also representing the nature of live/rebirth and eternity with it's ever spiraling extremities.