罗马数字是一套源自古罗马的数字系统，并且在欧洲一直到中世纪晚期都是编写数字的常用方式。 该系统中的数字由拉丁字母表中的字母组合而成。 现代用法中使用了七个符号，其中每个符号对应的阿拉伯数字为：([英]: Roman numerals are a numeric system that originated in ancient Rome and remained the usual way of writing numbers throughout Europe well into the Late Middle Ages. Numbers in this system are represented by combinations of letters from the Latin alphabet. Modern usage employs seven symbols, each with a fixed integer value:)
| 罗马数字 符号 | 阿拉伯数字 |
|---|---|
| I | 1 |
| V | 5 |
| X | 10 |
| L | 50 |
| C | 100 |
| D | 500 |
| M | 1000 |
在罗马帝国衰落之后，罗马数字的使用持续了很长时间。 从14世纪开始，罗马数字在大多数情况下开始被更方便的阿拉伯数字所取代; 然而，这个过程是渐进的，直到今天，罗马数字仍然在某些领域被使用。([英]: The use of Roman numerals continued long after the decline of the Roman Empire. From the 14th century on, Roman numerals began to be replaced in most contexts by the more convenient Arabic numerals; however, this process was gradual, and the use of Roman numerals persists in some minor applications to this day.)
例如：我们经常可以在钟表上看到罗马数字。 其中1到12的被写成：([英]: One place they are often seen is on clock faces. For instance, the hours from 1 to 12 are written as:)
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