The Tom fool's knot, also called the conjurer's knot or bow knot, is sometimes considered a handcuff knot but is somewhat inferior for this purpose to the knot which usually bears that name. It is a good knot with which to commence a slightly fancy sheepshank. It is also used as a trick knot due to the speed with which it can be made.
Tom fool's knot is believed to be the knot epankylotos brokhos described by the 1st Century Greek physician Heraklas.[1]
It is formed by making two loops, not exactly overlaying each other. The inner half of each hitch or loop is pulled under and through the outer side of the opposite loop.