This is a rendering I did in Blender 2.79b of a coin with the Perenne knot for 3D Print.
This symbol is of Celtic origin, and that represents eternal love. It is a knot that can not be undone and that has no beginning or end, so it was used to concretize the infinite union of a couple. In each generation, parents give this symbol to their children, to perpetuate their lineage.
If you are interested, I recommend you visit the page of my project in CGTrader:
https://www.cgtrader.com/3d-print-models/jewelry/other/perenne-knot-celt-symbol
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