The trefoil is perhaps the easiest knot to find in "nature", and is topologically equivalent to the interlaced form of the common Christian and pagan "triquetra" symbol [1]:
 Mike Hutchings' Rope Trick |
 Thurston's Trefoil - Figure Eight Trick |
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 A trefoil near the Hollander York Gallery |
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 The NeverEnding Story is a connected sum of two trefoils. |
 Logo of Caixa Geral de Depositos, Lisboa |
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 A hagfish tying itself in a knot to escape capture. |
A basic form of the Triquetra; as a Christian symbol, it refers to the Trinity
One version of the Germanic "Valknut" symbol
