penknife
Also known as pen knife, pocket knife, pocketknife, folding knife
thumb|A simple penknife thumb|A 16th century depiction of using a penknife on a quill
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thumb|A simple penknife thumb|A 16th century depiction of using a penknife on a quill
A penknife, or pen knife, is a small folding knife. Today, penknife is also the common British English term for both a pocketknife, which can have single or multiple blades, and for multi-tools, with additional tools incorporated into the design.