Page 13 - Geoffrey Budworth, Jason Dalton "The Little Book of Incredibly Useful Knots"

Slipped square knot

The slipped square knot is generally used when something needs to be secured to a post or spar,

but must be capable of being released quickly—for example, to secure netting to an overhead
pole for mending, or for lashing to a pole a flag that needs to be unfurled quickly.

Begin by wrapping a length of rope around the post and the item to be secured. Lay the left-hand
rope on top of the right, then pass the left end beneath the other rope (1). Now form a bight in the

right-hand end, and place it on top of the other rope, passing the free end over the bight and
through the loop (2). Pull the working bight and opposite end to tighten the knot (3). The finished
knot (4) can be quickly untied by pulling the free end of the bight.