Nine Tail Whip (3.5e Equipment)
From D&D Wiki
The cat is made up of nine knotted thongs of cotton cord, about 2 1⁄2 feet or 76 cm long, designed to lacerate the skin and cause intense pain.
It traditionally has nine thongs as a result of the manner in which rope is plaited. Thinner rope is made from three strands of yarn plaited together, and thicker rope from three strands of thinner rope plaited together. To make a cat o' nine tails, a rope is unravelled into three small ropes, each of which is unravelled again.