The triquetra is a set of three interlinked triangles drawn with a single line surrounded by a circle. One triangle points upward and the other two point down and out to the sides. The name of the symbol comes from the Latin word triquetrus which means “three cornered.”
The original origins of the symbol are a matter of debate. The symbol has been found in Norse Viking imagery, Indian heritage sites, Japanese artifacts, Celtic works and early Germanic coins. It is most often, however, associated with the ancient Celts due in part to the similarity between its design and the famous Celtic knot artwork.
In recent years, the triquetra has been co-oped by Neopagan groups to represent the Three Fold Goddess, but the triangular knot has long been a Christian symbol. The three triangles represent the Holy Trinity, and the triquetra is sometimes called the Irish Trinity Knot. The use of one line to draw all three triangles symbolizes that all three persons in the Holy Trinity are one God, and the circle that commonly surrounds the triquetra is said to represent God’s all-encompassing love.