Backhand hitch is a hitching knot used to attach rope to an object. It can be tied with the rope under tension making it very useful in certain situations. It can also be released while loaded. After untying the two locking half hitches whats left is Munter hitch that can be used to slowly release the load.
Used for tying down loads for example to a roof rack.
It can take very high loads but will still be easy to untie.