Figure-eight loop

Figure-eight loop
Names	Figure-eight loop, Flemish loop
Category	Loop
Related	figure-eight knot, flemish bend, Figure-of-nine loop, spider hitch
Releasing	Jamming
Typical use	climbing, caving
Caveat	jams
ABoK	#1047, #531
Instructions	[1]

Figure-eight loop (also figure-eight on a bight, figure-eight follow-through, figure-eight retrace, Flemish loop, or Flemish eight) is a type of knot created by a loop on the bight. It is used in climbing and caving.

The Flemish loop or figure-eight loop is perhaps stronger than the loop knot. Neither of these knots is used at sea, as they are hard to untie. In hooking a tackle to any of the loops, if the loop is long enough it is better to arrange the rope as a cat's paw.

— The Ashley Book of Knots^[1]

The double figure eight is used to put a loop in the end of a rope, or around an object. It is relatively easy to tie and is secure, but can become difficult to untie after heavy loading, and can jam badly in any rope type.