Trefoil knot
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In knot theory, a branch of mathematics, the trefoil knot is the simplest example of a nontrivial knot. The trefoil can be obtained by joining the two loose ends of a common overhand knot, resulting i
Trefoil knot used in ATV's logo
Mathematical surface in which the boundary is the trefoil knot in different angles
Valknut
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The valknut is a symbol consisting of three interlocked triangles forming subliminal triskelion at its center. The term valknut is a modern development; it is not known what term or terms were used to
The Tängelgårda stone from Gotland, Sweden, features valknuts below a depiction of a horse.