The Triquetra is an ancient symbol of the female trinity, being composed of three yonic vesicas interlaced so as to form the continuous "gateless" type of design always regarded as protective. Sometimes the three vesicas were further interlaced with a surrounding circle.

Thus the triquetra came to be called a symbol of "glory" and aslo

the Celtic Trinity

Here is my rendition, in Crystal Bevel Stained Glass, with chain for hanging. quite large, it measures about 11 inches by 11 inches by 11 inches, of continuous and open crystal with Gateless knot work, truly a Magickal shimmering design