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...

Ribbons (straight lines and 2/3 circles)	Ribbons (circular arcs)	Tightly-knotted form	Celtic
A Knotted Box [3]	A trefoil near the Hollander York Gallery [4]	A Knotted Pencil [5]	Thurston's Trefoil - Figure Eight Trick [6]
Banco Do Brasil [7]	A hagfish tying itself in a knot to escape capture. [8]	One version of the Germanic "Valknut" symbol	A Kenyan Stone [9]
Square depiction	In the form of an architectural trefoil	Polar equation curve.	Mike Hutchings' Rope Trick [10]
The NeverEnding Story logo is a connected sum of two trefoils. [11]

Non-prime (compound) versions

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

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

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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 a configuration of two trefoils along a closed loop which is prime, see 10_120.