What is the Triquetra?
Lets start by looking at the shape:
Looking at the image above, you will see that this particular Triquetra is made up of two components. The main part is the endless infinite set of what appears to be three oval loops. This is the Triquetra (Latin for “three cornered”) or can be called the Trinity Knot or Celtic Triangle. Because of the endless effect, there is symbolism of infinity and immortalisation, which is also a form of protection.
The circle encompassed within the Triquetra is common, and is seen to be the most popular way the Triquetra is represented in many cultures and groups.
The circle element brings spiritual unity, which intersects the Triquetra, forming an infinite loop within an infinite loop, enhancing the protection.
Where did the symbol originate?
It is difficult to date the exact origin of the Triquetra, and whether it was first used in a Christian or pagan context but it is thought that the design is used as a religious symbol adapted from ancient Pagan Celtic images by Christianity.
Celtic followers 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), or as a symbol of one of the specific Celtic triple goddesses, for example the battle goddess, The Morrígan.