Metal Type Base metal Dimensions Width (Inches): 0.47, Height (mm): 11, Width (mm): 12, Height (Inches): 0.43, Total Weight (g): 1.85. The Trinity Knot is a traditional Celtic symbol which consists of three arcs entwined in a triangular pattern. It is commonly referred to as the Triquetra, meaning 'Triangle' in Latin, and may be linked to the Triskele, a threefold spiral that dates back to Celtic antiquity.