Double fisherman's knot

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Double Fisherman's knot
Names	Double Fisherman's knot, Grapevine, Double englishman's knot
Category	Bend
Origin	Ancient
Related	Fisherman's knot, Triple fisherman's knot, Double overhand knot, Strangle knot
Releasing	Jamming
Typical use	Joining thin, stiff or slippery lines, backing up critical knots such as the Figure-of-eight loop or Figure-of-eight follow through
Caveat	Difficult to untie
ABoK	#294, #1415, #498

The double fisherman's knot or grapevine knot is a bend. This knot and the triple fisherman's knot are the variations used most often in climbing, arboriculture, and search and rescue. The knot is formed by tying a double overhand knot, in its strangle knot form, with each end around the opposite line's standing part.