反手结(overhand knot)是一种最根本绳结，是很多其他绳结的基础。反手结十分牢固，故所用之处应该是永久不解的。反手结常被用于防止绳尾散开。

The overhand knot is one of the most fundamental knots, and it forms the basis of many others, including the simple noose, overhand loop, angler's loop, reef knot, fisherman's knot, and water knot. The overhand knot is a stopper, especially when used alone, and hence it 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.