[mathematics] In knot theory, the square knot is a composite knot obtained by taking the connected sum of a trefoil knot with its reflection. It is closely related to the granny knot, which is also a connected sum of two trefoils. Because the trefoil knot is the simplest nontrivial knot, the square knot and the granny knot are the simplest ... Found on http://en.wikipedia.org/wiki/Square_knot_(mathematics)
(from the article `knot`) ...knot, a loop instead of the rope`s end is slipped through the first loop. Such a knot is easily slipped loose by pulling on its free end. ... ...with 16 crossingsthe highest known by the end of the 20th century. Certain higher-order knots can be resolved into combinations, called products, ... [2 re... Found on http://www.britannica.com/eb/a-z/s/146