Knot

Nordisk familjebok knots:
Knot board on Elbe 1 (ship, 1965)
An example of a quipu from the Inca Empire, currently in the Larco Museum Collection.
Alexander Cuts the Gordian Knot, by Jean-Simon Berthélemy (1743–1812)
Gordian Knot statue (1990)
Magimagi sennit of Fiji around wooden ceiling posts.
Blackfoot "Teton" tipi tie

A knot is an intentional complication in cordage which may be practical or decorative, or both. Practical knots are classified by function, including hitches, bends, loop knots, and splices: a hitch fastens a rope to another object; a bend fastens two ends of a rope to each another; a loop knot is any knot creating a loop; and splice denotes any multi-strand knot, including bends and loops. A knot may also refer, in the strictest sense, to a stopper or knob at the end of a rope to keep that end from slipping through a grommet or eye. Knots have excited interest since ancient times for their practical uses, as well as their topological intricacy, studied in the area of topology known as knot theory.