Triquetra

The triquetra (/traɪˈkwɛtrə/ try-KWEH-truh; from the Latin adjective triquetrus "three-cornered") is a triangular figure composed of three interlaced arcs, or (equivalently) three overlapping vesicae piscis lens shapes.

The term triquetra in archaeology is used of any figure consisting of three arcs, including a pinwheel design of the type of the triskeles.

Such symbols become frequent from about the 4th century BC ornamented ceramics of Anatolia and Persia, and it appears on early Lycian coins.

The triquetra is often found in insular art, most notably metal work and in illuminated manuscripts like the Book of Kells.

In the TV series The Walking Dead (2010), Michonne's katana features a triquetra, chosen for its meaning as a "triple goddess symbol".

This symbol can be seen on the Cave's metal door, on the Emerald Tablet, in The Stranger's papers, and in the Sic Mundus photo.

After Odin utters to Mjölnir the words "Whosoever holds this hammer, if he be worthy, shall possess the power of Thor", the Triquetra vanishes.