Triquetra denotes a particular complicated shape formed of three vesicae piscis (the leaf-like shape in between two equal diameter circles each centered on the circumference of the other), sometimes with an added circle in or around the three lobes. Also known as a "Trinity Knot" when parallel doubled-lines are in the graph, the design is used as a religious symbol adapted from ancient Pagan Celtic images by Christianity. It is similar to the valknut, a Norse symbol

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