As with all "bends," the fisherman's bend joins the ends of two ropes. An advantage of the fisherman's bend is that it is relatively small. The potential downside is they are very difficult to untie after holding a heavy load. Because of this, the fisherman's bend is primarily used to join ropes that will not need to be untied (e.g., to create Prusik loops).
When this bend is tied using overhand knots, it is simply called a fisherman's bend. When the individual knots are tied with two wraps (as shown below), the individual knots are called double fisherman's knots and the resulting bend is called a double fisherman's bend. The knots can also be tied with three wraps (i.e., triple fisherman's knots).
This illustration shows the steps to tie a double fisherman's bend.
One half of a fisherman's bend can also be used to create a stopper knot near the end of a rope.
The following illustrations show two methods of tying a double overhand stopper.
All illustrations on this website were created using the vRigger software.