This lanyard/zipper pull uses a slipped overhand knot as its base.
The idea for the knot came from drawings in:
"Knots, useful and ornamental" by Shaw, MCMXXIV.
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Make an overhand knot.
Bring the working end (WE) through the overhand knot The loop will serve as the loop of the lanyard.
Bring WE up through the overhand knot making a bight.
Bring WE over to the right.
And down through the bight.
Pull on A to tighten up the bight.
Then pull pn WE to complete the knot. Tighten