Triquetra & trinity knot

The iconic triquetra (or trinity knot) is the most common kind of Celtic knot and has a myriad of symbolic interpretations. With one continuous line interweaving around itself, it symbolizes the eternal spiritual life as well as unity and trinity of soul, heart, and mind. This Celtic symbol can be used to signify the unity of your family and endless family love.
Pagans cherish it as a representation of the forces of Nature, earth, fire and water and it was latterly adapted by Christians to represent the three elements of the holy Trinity.