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STEVEDORE KNOT
Seaman's knot; stevedore = docker.
Websites: Wikipedia YouTube (in French) Images: Alain Esculier 




The stevedore knot is tied like the figureeight knot...  ... with an additional rotation around one of the loops.  A rotation by a quarter of a turn to the left,  attach the free ends, and get the above knot. 
We obtain a prime knot of the first class among the three knots with 6 crossings in the Rolfsen table. 
The stevedore knot is part of the family of knots obtained from two entangled loops the four ends of which are joined together after a certain number of halftwists, in other words, pretzel knots of type P(2,1,1,...,1).
one halftwist: trefoil knot  two halftwists: figureeight knot 4.1.1 


three halftwists: prime knot 5.1.2  four halftwists: stevedore knot 6.1.1 


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© Robert FERRÉOL
2018