Valknut

Old symbol of interlaced triangles, in various forms.

Triquetra (3 crossings)

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  Unicursal (equivalent to trefoil knot / triquetra)
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  (alternate)
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  Historic
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Borromean (6 crossings)

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  Equivalent to Borromean rings
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  Historic
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  Historic
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Other forms (not found in ancient carvings

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  6 crossings, but not alternating (i.e. not equivalent to Borromean rings)
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  Two mutually interlaced (30 crossings)
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  Complex quasi-valknut (9 crossings)
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  Alternate 9 crossings depiction