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Klingon knife used in the Hegh'bat ceremony
A knife is a sharp-edged hand tool typically used for cutting. A minimal knife is a blade and a handle or some other method of gripping it. On Earth, knives have been used as tools and weapons since the Stone Age.
The first Earth knives were made of rock, chipped or ground to an edge, sometimes with a handle. Advances in technology led to blades made of bronze, iron, steel, and other exotic materials. Many cultures, such as the Klingons, have special knives for significant purposes such as eating, ceremonial practices, and assassinations.
- Captain Jean-Luc Picard claims that he spells "knife" with an 'n'. (TNG: "The Big Goodbye")