Trinity medallion is at the center of decorative resin wall cross 6' x 9.25'. coppery shaded accents and dimensional trim. Enclosed gift card with Trinity sentiment. Trinity Treasures Collection. The Trinity KnotThe Celtic Trinity Knot (or triquetra, meaning 'three-cornered') is a Christian symbol for the Trinity: God the Father, Son and Holy Spirit. The interwoven circle symbolizes the 'whole' created through the unity of the three Persons, a sign of unending life and love. Boxed for giving.