1. Alpine butterfly knot
The butterfly loop, also known as lineman’s loop, butterfly knot, alpine butterfly knot, and lineman’s rider.
This loop is used for a secure loop in the middle of a rope when the ends aren’t free.
The bowline is well known as a rescue knot for such purposes as rescuing people who might have fallen down.
3. constrictor knot & Double constrictor knot
The constrictor knot is one of the most effective binding knots. Simple and secure, it is a harsh knot that can be difficult or impossible to untie once tightened.