Daggers are most likely the predecessor to the sword. Historically they were usually double edged and used to deliver quick, lethal strokes. Their small size made it perfect for those more nefarious types. Stilettos, from the Latin stilus for stake, were used more for stabbing rather than cutting. The long narrow blade tapers to a point. AtlantaCutlery.com carries a wide assortment of quality daggers.
These WWI, close quarters fighting knives were designed for stabbing from behind with a natural movement with the high carbon steel blade held horizontal to the ground. Includes standard top-grain leather scabbard sewn with waxed linen thread and brass hardware.