Also known as
Machard Knot
What is the Klemheist Knot?
The Klemheist knot is a hitch often used in climbing.
The Klemheist Knot, what is it used for?
The Klemheist knot can be used to ascend or descend a climbing line. It is often used in combination with the secured foot-lock technique.
You can also use the Klemheist as a backup friction hitch when rappelling down (Abseiling) a climbing line, for example when you have reached the top of your sport climbing route.
Remarks
Technically is the Klemheist not a knot but a friction hitch.