(nautical) A knot placed in a rope either to prevent the end from fraying, or to prevent it from passing through a hole.

An overhand knot.

(topology) A knot that has a knot diagram in which, in traveling along the knot, one passes through intersections alternatingly: over, under, over, under, etc.

A knot that may be used to keep an object or multiple loose objects together, using a string or a rope that passes at least once around them.

A team-building exercise in which a group of people form a circle and hold hands with others in the circle, and then disentangle themselves.

(topology) A representation in the plane of a knot, with no triple points.

A knot similar to the reef knot but crossed the opposite way.

A knot tied in the bight, having two adjustable loops in opposing directions, able to be tightened around hands or feet.

(mathematics) A knot made from a single loop that crosses itself three times

(topology) A knot formed by joining the two loose ends of a overhand knot to form a knotted loop; the simplest non-trivial knot.