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Figure-eight knot of practical knot-tying, with ends joined. In knot theory, a figure-eight knot (also called Listing's knot [1]) is the unique knot with a crossing number of four. This makes it the knot with the third-smallest possible crossing number, after the unknot and the trefoil knot. The figure-eight knot is a prime knot.
The figure-eight knot or figure-of-eight knot is a type of stopper knot. It is very important in both sailing and rock climbing as a method of stopping ropes from running out of retaining devices. Like the overhand knot , which will jam under strain, often requiring the rope to be cut, the figure-eight will also jam, but is usually more easily ...
This is to make it consistent with File:Directional_figure_8_knot_Loop_Down.svg: 12:24, 27 January 2007: 217 × 490 (14 KB) Amada44: replaced bitmap parts of file with vector data: 19:14, 8 April 2006: 271 × 612 (245 KB) LadyofHats: diagram on how to tie this knot. the diagram i did on adobe ilustrator and release it into public domain
Figure-eight knot of mathematical knot theory in a simple square depiction. For a different (curvy) visual depiction, see File:Figure8knot-mathematical-knot-theory.svg . For an alternative (topologically-equivalent) representation of the knot, see File:Figure8knot-math-square-alternate.svg .
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The directional figure eight (a.k.a. inline figure-eight loop) is a loop knot. It is a knot that can be made on the bight. The loop must only be loaded in the correct direction or the knot may fail. It is useful on a hauling line to create loops that can be used as handholds.
The figure 8 belay device is a piece of metal (usually an aluminum alloy) in the shape of an 8 with one large end and one small end. Usage
A figure-of-eight loop tied using the follow-through method. A figure-eight loop is created by doubling the rope into a bight, then tying the standard figure-eight knot.. In climbing, this knot is used to save time when repeatedly attaching the rope to climbing harnesses, using locking carabiners, such as when a group of people are climbing on the same top-rope.