System of representing numbers devised by the ancient Romans.
The numbers are formed by combinations of the symbols 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; for example, II = 2 and LX = 60. A symbol placed before one of greater value subtracts its value; for example, IV = 4 and XL = 40. A bar over a symbol indicates that its value should be multiplied by 1,000.