Trinity Knot (Triquetra) earrings, Celtic Collection, #2

Lightweight birch plywood Trinity symbol earrings. Metal parts are made of stainless steel.

Triquetra, or the Trinity knot (from the Latin adjective triquetrus, "triangular"), is a triangular symbol formed from three interlocking arcs or three overlapping "vesicae piscis" lens shapes. (Source: Wikipedia)

For Christians, the Trinity symbolises the Holy Trinity: the Father, the Son, and the Holy Spirit.

In Celtic culture and religion, 3 is a sacred number, and everything meaningful occurs in threes, such as the threefold nature of the human soul, the three principal realms of land, sea, and sky, or the three main elements of fire, earth, and water.
(Source: symbolsage.com/trinity-knot-symbol)