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 [12]:
A knot consists of two harts in Kolam [1]
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Mike Hutchings' Rope Trick [2]
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Thurston's Trefoil - Figure Eight Trick [3]
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Further images...
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A trefoil near the Hollander York Gallery [6]
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The NeverEnding Story is a connected sum of two trefoils. [8]
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Logo of Caixa Geral de Depositos, Lisboa [9]
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A hagfish tying itself in a knot to escape capture. [11]
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A basic form of the interlaced Triquetra; as a Christian symbol, it refers to the Trinity
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One version of the Germanic "Valknut" symbol
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