Entertainment / Literature / Ogam: The term comes from Old Irish, 'Oghma,' probably an eponym of Oghma the Irish god of invention. It refers to a form of symbolic Celtic markings common in the 5th and 6th centuries in which a communicant would scratch or notch a series of marks on the edge of a stone or on a stick to indicate letters. The number and direction of the scratches or notches indicated the specific sound to form a word, and together they constituted an entire writing system. Ogam markings are commonly found on Irish standing stones, tombs, and boundary markers, and the alphabet the Irish used consisted of 20 letters, though slightly different systems existed in Wales and in Europe.
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