3 1 Further Notes and Views

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]:

Logo of Caixa Geral de Depositos, Lisboa [1]

A knot consists of two harts in Kolam [2]

A basic form of the interlaced Triquetra; as a Christian symbol, it refers to the Trinity

3D depiction

Further images...

Trefoil/triquetra without outside corners (made from straight lines and 240° circular arcs)	Triquetra made from circular arc ribbons	Tightly-knotted form	Celtic-style
A Knotted Box [3]	A trefoil near the Hollander York Gallery [4]	A Knotted Pencil [5]	Trefoil depicted in non-threefold form
3D depiction in non-threefold form	A hagfish tying itself in a knot to escape capture. [6]	One version of the Germanic "Valknut" symbol	A Kenyan Stone [7]
Square depiction	In the form of an architectural trefoil	Polar equation curve.	Alternate Valknut depiction
Simple overhand knot of practical knot-tying	Tightly folded pentagonal overhand knot	Visually fancier square trefoil	Banco Do Brasil [8]
The NeverEnding Story logo is a connected sum of two trefoils. [9]	Mike Hutchings' Rope Trick [10]	Thurston's Trefoil - Figure Eight Trick [11]

Non-prime (compound) versions

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  Two trefoils (single-closed-loop version of the "granny knot" of practical knot-tying).

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  Two trefoils (single-closed-loop version of the "square knot" of practical knot-tying)

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  3D square knot

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  Three trefoils (symmetrical).

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  Four trefoils (Celtic or pseudo-Celtic decorative knot which fits in square)

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  Three trefoils along a closed loop which itself is knotted as a trefoil.

For configurations of two trefoils along a closed loop which are prime, see 8_15 and 10_120. For a configuration of three trefoils along a closed loop which is prime, see K13a248. For a prime link consisting of two joined trefoils, see L10a108.