short length of rope used to attach part of a rigging or climbing system to a tree. The term is often used in place of lanyard (e.g.. chain-saw strop).

Merriam-Webster Online Dictionary
strop (noun)
- strap
a) a short rope with its ends spliced to form a circle
b) a usually leather band for sharpening a razor
strop (verb)
transitive verb
to sharpen (a razor) on a strop
strop (Wikipedia)
A straight razor with a hanging strop

A razor strop (or razor strap) is a flexible strip of leather, canvas, denim fabric, balsa wood, or other soft material, used to straighten and polish the blade of a straight razor, a knife, or a woodworking tool like a chisel. In many cases stropping re-aligns parts of the blade edge that have been bent out of alignment. In other cases, especially when abrasive polishing compound is used, stropping may remove a small amount of metal. Stropping can also burnish (i.e. push metal around on) the blade.

The strop may be a hanging strop or a hand-held paddle. Various abrasive compounds may be applied to the strop to aid in polishing the blade while stropping to obtain a mirror-like finish. Common abrasive compounds include half-micron diamonds, green chromium(III) oxide, white rouge (aluminum oxide), and jeweller's rouge (iron(III) oxide).

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