Ligature knot (Accepted)

The “ligature knot” or “surgeon’s knot” appears to be a Society invention; the knot may well have been used by period surgeons, but we’ve no evidence of its use in period armory.

Gareth of Bloodwine Gorge bears:  Sable, in saltire a pen Or, quilled argent, surmounted by a sword inverted proper, all within an annulet knotted in chief by a ligature knot argent.