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A knife is a sharp-edged, single or double edged, instrument consisting of a thin blade used for cutting and fitted with a handle. The knife can be used as a tool or a weapon. The knife is considered by some to be one of the most useful tools of all time. Its date of origin is as far back as two-and-one-half million years ago, as evidenced by the Olduwan tools.
Today, knives come in many forms but can be categorized in two different types: fixed blade knives and folding, or pocket, knives. Although each has inherent advantages, the two have many similar characteristics. Modern knives consist of a blade and handle. The blade can be fine or serrated. The handle, used to grip and manipulate the blade safely, may include the tang, a portion of the blade that extends into the handle. The blade consists of the point, the end of the knife used for piercing, the edge, the cutting surface of the knife extending from the point to the heel, the grind, the cross-section shape of the blade, the spine, the top, thicker portion of the blade, the fuller, the groove added to lighten the blade, and the bolster, the thick portion of the blade joining the blade and the handle. The guard is a barrier between the blade and the handle which protects the hand from an opponent, or the blade of the knife itself. A choil, where the blade is unsharpened and possibly indented as it meets the handle, may be used to prevent scratches to the handle when sharpening or as a forward-finger grip. The end of the handle, or butt, may allow a lanyard, used to secure the knife to the wrist. |
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