INTERWOVEN CIRCLES (also the TRIQUETRA) The triangle is one of the oldest symbols of the Blessed Trinity. The continuous form of this symbol – three interwoven arcs is produced by an unbroken line. If you’re Irish, you will most certainly have this symbol in your heritage. Celtic crosses most likely will bear a representation of this symbol. Many drawings of cradles found in the Christian Nativity will have this symbol on the headboard.