A buckle is a clasp for use on straps, belts, &c. It is one of the oldest of heraldic charges; in early blazons it is called a “fermail”, as in the canting arms of Malet, c.1275 [ANA2 223]. The buckle may be lozenge-shaped (in which form it is also called an “arming buckle”), round, square, or oval; the exact shape should be specified. (The most common forms in mundane heraldry seem to be round or lozenge-shaped, as in the illustration.) The position of the tongue is left to the artist. For related charges, see brooch.
Medb Liath bears: Azure, six round buckles Or.
Oswin de Kokerham bears: Gules, three crosses fleury and on a chief indented Or two arming buckles sable.
Sláine ní Chiaráin bears: Per pale vert and gules, two round buckles argent.