I found this knot in an old "Handbook of knots for seamen". It is another slide and lock loop knot.
Males a nice lanyard or zipper pull.
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Bring working end (WE) over to the right forming a loop.
Bring WE to the left going under (forming a small bight).
Bring WE end up.
and to the right going under.
Bring WE down through the bight formed in step 2.
Adjust loop size by pulling on A or a.
Pull on B and b to lock loop in place. Tighten.