This is a Alpine Butterfly Knot is also known as a lineman loop and heaps more. The Alpine Butterfly Knot is also used for fishing and more.
I rate the Alpine Butterfly Knot out 3/10 because its very easy.
This is the figure-eight knot. The figure-eight knot is one of the strongest knots. The figure eight knot is used to be a stopper knot. The figure-eight knot is very easy to tie. I rate the figure-eight knot out of 2/10 because its very easy to tie.