Flaunches (singular “flank”) are heraldic ordinaries, issuing from the corners of the chief, and proceeding in circular arcs to base. Their origin is obscure: they’re said to represent the gaps in a lady’s sideless surcoat.
Flaunches always occur in pairs; there are no single flaunches. They were sometimes charged in period, the earliest instances dating to c.1460, with the arms of Greyby [Hope 62]. Flaunches may therefore be charged in Society heraldry.
Some texts consider flaunches to be sub-ordinaries, but Society heraldry doesn’t recognize that distinction. Flaunches do share the restrictions on other single-sided ordinaries, however: they may not be voided, cotised, or fimbriated. There are no diminutives of flaunches in Society heraldry, nor may they be borne enhanced.
Karen de Wyvern bears: Erminois, a pair of flaunches purpure.
Chad MacBean bears: Sable, flaunches argent.
Kat’ryna Neblaga Volchkova bears: Vair, flaunches gules.