Refers to the ancient Roman way of writing numbers. Likely because of the elegant style, it is still usually recognized and understood by everyday people (at least from 1 to 10), as well as frequently used on clocks.

* 1 = I
* 2 = II
* 3 = III
* 4 = IV (one below 5)
* 5 = V
* 6 = VI (one above 5)
* 7 = VII (two above 5)
* 8 = VIII
* 9 = IX
* 10 = X (can be remembered by how 2 V's form an X; 5*2=10)
* 11 = XI
* 12 = XII

* 50 = L
* 100 = C
* 500 = D
* 1000 = M

h4. See also

* [[dial]]

h4. External links

* "Wikipedia: Roman numerals":https://en.wikipedia.org/wiki/Roman_numerals
ローマ数字 罗马数字