"Trinity Knot" dangle earrings by Keith Jack in sterling silver and 10 karat yellow gold with cubic zirconia (CZ) accents; leverbacks. The Trinity Knot is the most recognized of all Celtic symbols. While there are many different interpretations, most seem to agree on a joining of three (3) entities, three (3) being a sacred number to the Celts. The three (3) life stages: Maiden, Mother, and Wise Woman.