A stiletto (plural stilettos) is a specialized dagger with a long slender blade and needle-like point, primarily intended as a thrusting and stabbing weapon.
The stiletto blade's narrow cross-section and acuminated tip (that is, a tip which tapers to a sharp point) 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.
A dagger is a fighting knife with a very sharp point and usually one or two sharp edges, typically designed or capable of being used as a cutting or thrusting weapon. Daggers have been used throughout human history for close combat confrontations, and many cultures have used adorned daggers in ritual and ceremonial contexts. The dagger's distinctive shape and historic usage have made it iconic and symbolic. In the modern sense, a dagger is designed for close-proximity combat or self-defense; due to its use in historic weapon assemblages, it has associations with assassination and murder. However, double-edged knives play different roles in different social contexts.
A wide variety of thrusting knives have been described as daggers, including knives that feature only a single cutting edge, such as the European rondel dagger or the Afghan pesh-kabz, or, in some instances, no cutting edge at all, such as the stiletto of the Renaissance. However, in the last hundred years or so, in most contexts, a dagger has specific definable characteristics, including a short blade with a sharply tapered point, a central spine or fuller, and usually two cutting edges sharpened the entire length of the blade, or nearly so. Most daggers also feature a full crossguard to keep the hand from riding forwards onto the sharpened blade edges.
The Fairbairn–Sykes fighting knife is a double-edged fighting knife resembling a dagger or poignard with a brass or wooden foil grip. It was developed by William Ewart Fairbairn and Eric Anthony Sykes in Shanghai based on ideas that the two men had while serving on the Shanghai Municipal Police in China before World War II.
The F-S fighting knife was made famous during World War II when issued to British Commandos, the Airborne Forces, the Special Air Service (SAS) and many other units, especially for the Normandy landings in June 1944. With its acutely tapered, sharply pointed blade, the F-S fighting knife is frequently described as a stiletto, a weapon optimised for thrusting, although the F-S knife can be used to inflict slash cuts upon an opponent when its cutting edges are sharpened according to specification. The Wilkinson Sword Company made the knife with minor pommel and grip design variations.