Page 350 - Geoffrey Budworth, Jason Dalton "The Little Book of Incredibly Useful Knots"

Slipped overhand

Use this quick and simple knot as a temporary stopper in the end of thread, twine, string, or

cord. It is merely an overhand knot in which the working end has not been completely pulled
through.

Create a loop with the working end beneath the standing part (1). Then make a bight in the end
and tuck it down through the loop just formed (2) to serve as a quick-release drawloop (3). This is

one of the few knots that may be tightened simply by pulling the two knot parts in opposite
directions, in this case the standing part and the anchored leg of the drawloop (4).