Triquetra is a Norse Viking symbol closely connected with the Valknut and Horn Triskelion. Artifacts with Triquetra ornaments are found in all parts of the Viking world, ranging from the comb found in Gnezdovo (near Suzdal, Russia) to the saddle bow from Coppergate (York, England).
The Trinity knot is symbolic of the threefold nature of the Goddess as mother, maiden and crone. The mother as a goddess is representative of creation, the maiden is representative of innocence and the crone is representative of wisdom. It is also representative of the forces of nature (earth, fire and water) and the three interlocking circles are symbolic of female fertility.