Adjustable grip hitch
Encyclopedia
The adjustable grip hitch is a simple and useful friction hitch
which may easily be shifted up and down the rope while slack. It will hold fast when loaded, but slip when shock loaded until tension is relieved enough for it to again hold fast.
This knot is also called the adjustable loop.
Friction hitch
A friction hitch is a kind of knot used to attach one rope to another in a way that is easily adjusted. These knots are commonly used in Single Rope Technique while climbing to ascend a hanging rope by alternately hanging on one friction hitch and sliding the other up...
which may easily be shifted up and down the rope while slack. It will hold fast when loaded, but slip when shock loaded until tension is relieved enough for it to again hold fast.
This knot is also called the adjustable loop.