I always thought from learning knots and splicing from the QM's as a cadet that it was a Monkeys Fist that we made as the weight on the heaving line. The Turks Head was more decorative and looked good for example on the tops of railing stanchions on gangways etc.
The art of throwing a heaving line to waiting shore mooring men was fraught with danger-for them,especially before hard hats became the norm I think we all overcompensated at first and either brained the intended recipient or missed him by a mile.
A monkeys fist,with a nut in ,on a shortened line would be called a flail I suppose and would be illegal today as a weapon.I 've just learned that the Monkey's fist on a flail was indeed carried ashore by our early sailor ancestors as protection against attackers. In my time,several centuries on it would have looked so absurd strolling down the Motomachi in Kobe with a Monkey's Fist on a rope...!:eek: