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A stiletto ] is a knife or dagger with a long slender blade and needle-like point, primarily intended as a stabbing weapon.
The stiletto blade's narrow cross-section and acuminated tip reduce friction upon entry, allowing the blade to penetrate deeply. Some consider the stiletto a form of dagger, but most stilettos are specialized thrusting weapons not designed for cutting or slashing, even with edged examples.
Over time, the term stiletto has been used as a general descriptive term for a variety of knife blades exhibiting a narrow blade with minimal cutting surfaces and a needle-like point, such as the 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 for certain boots and shoes.