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Ogham ∕ōm∕ is an early form of Irish inscription dating to the 4th century A.D. It is thought by many scholars to be a cipher of the Latin alphabet and is sometimes referred to as the Celtic “tree alphabet,” because each rune in Ogham corresponds to the name of a particular tree. Illustration by Stephen Reid, published in T. W. Rolleston’s Myths & Legends of the Celtic Race (1911).