 Or (gold) was designated by A (aurum), argent (silver) or white, respectively by a (argentum), azure (blue) with c (caeruleus), gules (red) by r (rubeus), and vert (green) by v (viridis).Though the sign for sable (black) (niger) was not present in his system traditionally it was designated by the black colour itself.The Benedictine historian Arnold Wyon (1554–ca.