What is the favourite symbol of your faith that you wear?

I'm not a jewelry wearer, so don't really have a symbol that I wear. Also, as a Celtic Reconstructionist, we know that there really isn't any One Symbol for the Celts, each tribe, indeed each individual, had their own. I am dedicated to Brighid, so both fire and wells are important for me. I am also a Unitarian Universalist, so the flame and chalice symbol of that Society is important. I sometimes where the 7 pointed star in symbolism of the 7 UU principles.