Girls ... this is simple:
1. the OP has likely left the thread;
2. the answer I use is Sumio's Symmetric Sheet Knot (3SK), named after the famous Japanese cruiser and
boatbuilder, Oya Sumio san.
Sumio puzzled over the problem, not liking to use a bowline because it was
asymmetric, a little too bulky, and - when used on the clew of the
jib of a
cutter - too prone to getting hung up on the (inner) forestay.
Sumio kept working on the issue and trying variations on the bowline, and 'discovered' the 3SK. Sumio taught me the knot.
Few useable knots are 'new'. The 3SK is one of the
family of what once were called Capstan Knots.
Capstan knots are made in the middle of a long line, from the
boat, around a capstan or cleat, and then back to a different position on the
boat. I've known not a few skippers who use a long line as, say, both a forward spring and an aft spring, and so use a capstan knot (not necessarily the 3SK) around the one
dock cleat/capstan.
Here're are (a) my clumsy attempt to use KnotMaker to diagram the 3SK; and (b) a diagram of the 3SK that I found in an old
English dictionary (
William Dwight Whitney The Century Dictionary and Cyclopedia: An encyclopedic Lexicon of the English Language (New York, NY: The Century Co., 1889)) which used it as THE diagram representing the
family of Capstan Knots.