Stiletto U.S. V-42 stiletto, while in American English usage, the name "stiletto" can also refer to a switchblade knife with a stiletto- or bayonet-type blade design. The term in plural "stilettos", is also used as slang for a long, thin, high heel (stiletto heel) for certain boots and shoes, usually worn by women. First developed in Italy, the stiletto dates from the late 15th century, and is thought to be a development of the rondel dagger or "misericordia", a needle-pointed weapon with a narrow blade designed primarily for thrusting, though possessing cutting edges. Early stilettos normally used a one-piece cast-metal handle
Stiletto fallen or severely wounded heavily armored opponent. The needle-like blade could, if used with sufficient force, penetrate most mail or find its way through gaps in a knight's plate armor, and was narrow enough to pass through the eye slits of the helmeted knight. A severely wounded opponent who was not expected to survive would be given a "mercy strike" (French "coup de grâce"), hence the name "miséricorde". Later, the Gunner's Stiletto became a tool for clearing cannon-fuse touch holes; used in the manner of an automotive oil dipstick, they were often inscribed with marks indicating levels of powder charges