< **1** >

### Roman numerals

In the past, roman numerals were used. You count therein as follows

Ⅰ Ⅱ Ⅲ Ⅳ Ⅴ Ⅵ Ⅶ Ⅷ Ⅸ Ⅹ

what corresponds to the Arabic numerals

1 2 3 4 5 6 7 8 9 10

##### Zero

There is no digit for 0 (Latin: **nulla**). There's been discussion for centuries whether or not 0 is a number. Today we call it a number, and for writing decimal numbers we need it.

##### Large numbers

The Romans had no decimal system and formed numbers by combining the different symbols.

012345678910111213I II III IV V VI VII VIII IV X XI XII XIII

102030405060708090X XX XXX XL L LX LXX LXXX XC

1005001 000C D M

1 0005 00010 00050 000100 000ↀ ↁ ↂ ↇ ↈ

##### IIII

Sometimes you will see roman numerals as decoration on buildings. On analog clocks, the hours are usually indicated with roman numerals. The number Ⅳ is almost always shown as ⅡⅡ. Because roman numerals have no symbol for 0, you start with Ⅻ.

Ⅻ ⅩⅠ Ⅰ Ⅹ ⅠⅠ Ⅸ Ⅲ Ⅷ ⅠⅠⅠⅠ Ⅶ Ⅵ Ⅴ

##### Additional information

The American mathematician Claude Shannon invented a computer with roman numerals called THROBAC.