The overhan knot is a type of knot. It is one of the most fundamental knots and forms the basis of many others including the Simple noose, overhand loop, angler's loop, and fisherman's knot and water knot. The overhand knot is very secure, to the point of jamming badly. It should be used if the knot is intended to be permanent. It is often used to prevent the end of a rope from unraveling.