A quick reference to roman numbers, aka roman numerals.

Numeral | I | V | X | L | C | D | M |
---|---|---|---|---|---|---|---|

Number | 1 | 5 | 10 | 50 | 100 | 500 | 1,000 |

Special characters for larger numbers:

Numeral | ↀ | ↁ | ↂ | ↇ | ↈ | |
---|---|---|---|---|---|---|

Apostrophus | |Ɔ | C|Ɔ | |ƆƆ | CC|ƆƆ | |ƆƆƆ | CCC|ƆƆƆ |

Number | 500 | 1,000 | 5,000 | 10,000 | 50,000 | 100,000 |

In addtion to this there is the "Vinculum" notation. By adding a line over the numeral, the number is multiplied by 1,000. Like this example:

V = 5,000

Fractions of 12 were used eg. for coins. These have a special notation:

Fraction | Numeral | Alt. | Fraction | Numeral | Alt. | |
---|---|---|---|---|---|---|

1/12 | • | 7/12 | S• | |||

2/12 | •• | : | 8/12 | S•• | S: | |

3/12 | ••• | ∴ | 9/12 | S••• | S∴ | |

4/12 | •••• | :: | 10/12 | S•••• | S:: | |

5/12 | ••••• | ⁙ | 11/12 | S••••• | S⁙ | |

6/12 | S | 12/12 | I |

And there's more still. Please see Wikipedia as this page is intended to be a quick reference only.