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Roman numerals, the numeric system used in ancient Rome, employs combinations of letters from the Latin alphabet to signify values. The numbers 1 to 10 can be expressed in Roman numerals as follows: :. The Roman numeral system is a cousin of Etruscan numerals. Use of Roman numerals continued after the decline of the Roman Empire. From the 14th century on, Roman numerals began to be replaced in most contexts by more convenient Hindu-Arabic numerals; however, this process was gradual, and the use of Roman numerals in some minor applications continues to this day. ==Roman numeric system== Roman numerals, as used today, are based on seven symbols:〔Alphabetic symbols for larger numbers, such as for 500,000, have also been used to various degrees of standardization.〕 Numbers are formed by combining symbols and adding the values, so is two (two ones) and is thirteen (a ten and three ones). There is no zero in this system and characters do not represent tens, hundreds and so on according to position as in 207 or 1066; those numbers are written as (two hundreds, a five and two ones) and (a thousand, a fifty, a ten, a five and a one). Symbols are placed from left to right in order of value, starting with the largest. However, in a few specific cases, to avoid four characters being repeated in succession (such as or ), subtractive notation is often used as follows: * placed before or indicates one less, so four is (one less than five) and nine is (one less than ten) * placed before or indicates ten less, so forty is (ten less than fifty) and ninety is (ten less than a hundred) * placed before or indicates a hundred less, so four hundred is (a hundred less than five hundred) and nine hundred is (a hundred less than a thousand)〔Stroh, Michael. (''Trick question: How to spell 1999? Numerals: Maybe the Roman Empire fell because their computers couldn't handle calculations in Latin.'' ) ''The Baltimore Sun'', December 27, 1998.〕 For example, is one thousand nine hundred and four, 1904 ( is a thousand, is nine hundred and is four). Some examples of the modern use of Roman numerals include: * 1954 as , as in the trailer for the movie ''The Last Time I Saw Paris'' * 1990 as , used as the title of musical project Enigma's debut album ''MCMXC a.D.'', named after the year of its release. * 2014 as , the year of the games of the (22nd) Olympic Winter Games (in Sochi) 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Roman numerals」の詳細全文を読む スポンサード リンク
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