An escutcheon is a heater-shaped shield, used as a charge in its own right since c.1244, in the arms of de Munchensy [Asp2 217]. Its default orientation is with its flat side to chief. In Society heraldry, to avoid the appearance of augmentations or arms of pretense, escutcheons used as charges should not themselves be charged.
Claude le Champenois bears: Barry sable and argent, an escutcheon gules.
Brendan McNeill O’Neill bears: Vert, three escutcheons Or.
Reis ap Tuder ap Wyn bears: Azure semy of escutcheons Or.