Prusik knot

A Prusik is a friction hitch or knot used to attach a loop of cord around a rope, applied in climbing, canyoneering, mountaineering, caving, rope rescue, ziplining, and by arborists. The term Prusik is a name for both the loops of cord used to tie the hitch and the hitch itself, and the verb is "to prusik" or "prusiking". More casually, the term is used for any friction hitch or device that can grab a rope.

Due to the pronunciation, the word is often misspelled Prussik, Prussick, or Prussic.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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