monkeytail

from The Century Dictionary.

• noun Naut:
• noun A short round lever formerly used for training carronades and for like purposes.
• noun A piece of rope with a knot at the end, seized to the back of a hook, used as a handle in attaching the hook, to prevent the hand from being jammed.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Naut.) A short, round iron bar or lever used in naval gunnery.