You know what it looks like… but what is it called?
TAKE THE QUIZ“prusik”
The following 2 entries include the term prusik.
Prusik knot
noun: a knot that is used in mountaineering for tying a small sling to a climbing rope as an aid to one who has fallen into a crevasse and that holds fast when weighted but is movable when unweighted
Prusik sling
noun: a small movable sling fastened to a climbing rope by means of a Prusik knot
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Merriam-Webster unabridged