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Both length and velocity are measured in knots; in the former case, it is equivalent to a Nautical mile; in the latter, to a Nautical mile per hour.

A knot consists of a length of one or more ropes, coiled through themselves in a way to produce a structural altering the characteristics of the rope. Knots may be used for fastening ropes to other structures, other ropes, or to let a rope slide along another rope.

Knots are often classified as loop, bend, whipping, decorative and hitch. Knots are instrumental in sailing and climbing, and many other activities.

Well known knots include:

hangman's noose slip bowline sheet bend square figure eight overhand single stopper double stopper reef knot clove hitch half hitch italian hitch water knot uni knot trucker's hitch http://www.troop9.org/knots/trucker.htm two half hitches http://www.troop7.org/Knots/TwoHalf.html trilene knot timber hitch tiller's hitch taut-line surgeon's knot surgeon's end loop square knot stevedor's knot slippery round hitch slippery hitch single hitch simple simon under simple simon over sheet bend sheep shank sailor's knot running knot round hitch rolling hitch ringbolt hitch pile hitch perfection loop orvis knot midshipman's hitch lariat loop palomar knot nail knot mooring hitch

descriptions and tying instructions should be added

In knot theory, a knot is an embedding of a circle in 3-D space, considered up to deformations (isotopies). This is basically equivalent to a conventional knot with the ends of the string tied together to prevent it from becoming undone. In higher dimensions, circles are unknotted anyways, so one considers embeddings of spheres and hyperspheres.

See also: Scouting