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The triquetra (Latin "triangle", also called the trinity knot) consists of three equal, interlaced arcs. It can be drawn in a single, endless line – and that is exactly what makes it a symbol of connection and cycle. As an endless knot it has no beginning and no end.
The triquetra is old – but not specifically "Viking". It already appears on Germanic gold bracteates and early runestones, is magnificently worked in insular (Irish-Anglo-Saxon) manuscript art such as the Book of Kells, and meets us in Norse craft – for instance in the interlace of the Mammen and Urnes styles. It was a widespread ornament across the whole Germanic-Celtic world.
There is no single "correct" meaning – honestly, that is the point. For some the number three stood for past–present–future or earth–sea–sky; in a Christian context it became an image of the Trinity. In the Viking Age it was above all ornament: a beautiful, artful interlace pattern that could express protection and unity without a fixed "doctrine" behind it.
Today the triquetra is a very popular symbol for family, love and connection – especially as an engraving on jewellery, rings or slate plates. Its clear, endless line suits laser engraving perfectly. Whoever wears it links to a very old visual language – and may fill it with their own meaning.
"Wits must he have who wanders wide, but all is easy at home."Hávamál 5, after Henry A. Bellows 1923 (public domain)
More on real and invented signs in our big symbol overview.

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