Pocketknife

A pocketknife (also spelled pocket knife) is a knife with one or more blades that fold into the handle. It is also known as a jackknife, or a folding knife. It may be referred to as a penknife, though a penknife may also be a specific kind of pocketknife. A typical blade length is 5 to 15 centimetres (2 to 6 in).