This beautiful antique silvertone pendant is in the form of a triquetra, also known as a Trinity Knot. 

Antiqued silvertone zinc alloy (nickel free). Pendant measures approximately 1” long.

For your pendant, you may select either a 17.5” silvertone snake chain with 3” extender chain, an 18” cable chain or an 18” or 20” leather cord necklace with lobster clasp and 2” extender chain. (2MM round black leather cord with silvertone findings.) 

The triquetra from the Latin adjective triquetrus "three-cornered") is a triangular figure composed of three interlaced arcs.

It is used as an ornamental design in architecture, and in medieval manuscript illumination (particularly in the Book of Kells). The symbol has been interpreted for many centuries as representing the Christian Trinity of Fat her, Son, and Holy Spirit and is also known as a Trinity Knot.

Other religions and cultures may use the triquetra to symbolise a variety of concepts and mythological figures. Due to its presence in insular Celtic art, some groups use the triquetra either to represent one of the various triplicities in their cosmology and theology (such as the tripartite division of the world into the realms of Land, Sea and Sky). The symbol is also sometimes used by Wiccans and some new agers to symbolize the Triple Goddess, or as a protective symbol.