A stopper knot is a knot that creates a fixed thicker point on an otherwise-uniform thickness rope for the purpose of preventing the rope, at that point, from slipping through a narrow passage, such a
Ashley's stopper knot, also known as the oysterman's stopper, is a knot developed by Clifford W. Ashley around 1910. It makes a well-balanced trefoil-faced stopper at the end of the rope, giving great
Stopper knot
…Stevedore knot Ashley's stopper knot The Chinese button knot and the Celtic button knot are decorative stopper knots…
The load-bearing face of an Ashley's stopper knot. This particular example was tied in an unusual manner, with what would normally be considered the "standing part" very short, to fully expose the knot's Trefoil-like face.