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 [1]:

Mike Hutchings' Rope Trick	Thurston's Trefoil - Figure Eight Trick	A Kenyan Stone
A Knotted Box	A trefoil near the Hollander York Gallery	A Knotted Pencil
The NeverEnding Story is a connected sum of two trefoils.	Logo of Caixa Geral de Depositos, Lisboa	Banco Do Brasil
A hagfish tying itself in a knot to escape capture.

One version of the Germanic "Valknut" symbol