What's the noun for knotting? Here's the word you're looking for.
knot
A looping of a piece of string or of any other long, flexible material that cannot be untangled without passing one or both ends of the material through its loops.
(nautical) A unit of speed, equal to one nautical mile per hour. (From the practice of counting the number of knots in the log-line (as it plays out) in a standard time. Traditionally spaced at one every 1/120th of a mile.)