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Roman numerals, a system of numerical notation based on the ancient Roman system. The symbols are I, V, X, L, C, D, and M, standing respectively for 1, 5, 10, 50, 100, 500, and 1,000 in the Hindu-Arabic numeral system. A symbol placed after another of equal or greater value adds its value—e.g., II = 1 + 1 = 2 and LVIII = 50 + 5 + 1 + 1 + 1 = 58. Usually...