Roman numerals are a number system developed in ancient Rome, where letters represent numbers. In modern usage, the letters I, V, X, L, C, D, and M are commonly used. The set of basic symbols in the Roman numeral system are: I = 1 (one) V = 5 (five) X = 10 (ten) L = 50 (fifty) C = 100 (one hundred) D = 500 (five hundred) M = 1,000 (one thousand) V̅ = 5,000 (five thousand) X̅ = 10,000 (ten thousand) L̅ = 50,000 (fifty thousand) C̅ = 100,000 (one hundred thousand) D̅ = 500,000 (five hundred thous