数字とローマ数字を相互変換
Numbers above 3,999 use vinculum notation: a line above a numeral multiplies its value by 1,000.
So XCCCXXX = 10,330.
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Did you know?
Florence Banned Arabic Numerals
In 1299, the city of Florence banned Hindu-Arabic numerals. The reasoning? They were too easy to forge. A 0 could become a 6 or 9. A 1 could become a 7. With Roman numerals, altering a number required adding or removing entire letters. The new system was so efficient it was too efficient for a world without modern auditing.
Read more →Why the NFL Chose Roman Numerals
When the Super Bowl started in 1967, the game was played in January but belonged to the previous season. Calling it "the 1966 championship played in 1967" was confusing. Roman numerals solved this elegantly: Super Bowl I, II, III. No year confusion, and it made the event feel like something ancient and important. Marketing genius disguised as tradition.
Read more →ローマ数字はどこから来たのか？
ローマ数字は手の合図や数え棒に由来すると考えられています。線のIは指1本を、Vは5を表す親指と指の間の隙間を、Xは10を表す交差した両手を表しています。L、C、D、Mはギリシャ文字のカイ、シータ、ファイを変形させたもので、それぞれ50、100、500、1,000を表します。時が経つにつれ、これらの記号は今日知られているラテン文字へと変化しました。ローマのアルファベットには0がありません。0の概念は、インドが紀元600年頃 / 10600 HEに発明するまで完全には発達しなかったためです。