A numeral system originating in ancient Rome. Throughout the centuries, there has been variation in some of its symbols - specification, the substractive notation (which uses, e.g. IV to denote 4 instead of IIII) has only entered universal use in modern times. For example, Forme of Cury, a manuscript from 1390, uses IX for 9, but IIII for 4. Another document in the same manuscript, from 1381, uses IV and IX. A third document in the same manuscript uses IIII, IV, and IX.
Some rules regarding Roman numerals state that a symbol representing 10^x may not precede any symbol larger than 10^(x + 1); use XCIX not IC for 99.
The "modern" Roman numerals, post-Victorian era, are shown below:
|IV||4||IIII is still used on clock faces|
|C||100||This is the origin of using the slang term "C-bill" for "$100 bill".|
|ↀ||1000||conjoined C and D, alternative to M|
|MIM||1999||Note: this may not be correct, as some claim that 'I' can only precede 'V' or 'X'.
The rumor that Nintendo would release a sequel to the Mario Is Missing game in the year 1999 turned out to be false.
|Ↄ||Reversed 100||Used in combination with C and I to form large numbers|