The Trident loop is a fixed loop knot. It can jam when heavily loaded. It was proposed as a replacement for the Figure-of-eight loop for use in climbing by Robert M. Wolfe, MD, who developed it as a loop form of Ashley's bend. While some tests indicate its strength lies somewhere between the weaker Bowline and stronger Figure-of-eight loop, the Trident loop shows exceptional resistance to slipping in shock-loading tests.