A **numeral** is a symbol used to represent the value of a number . It is important to remember that a numeral is not the number itself, only an agreed upon symbol chosen to represent it. It is very probable, given that an alien civilization exists, that they understand the number 3. This number is the same for both humans and aliens, no matter how many legs they have. However, the numeral used to represent it would be different.

# The Decimal / Octal / and Binary Numerals

The Decimal, Octal and Binary systems all use some set of the Arabic numerals. These numerals are 0 1 2 3 4 5 6 7 8 9.

The Binary system only uses 0 and 1 or 0 1.

The Octal system uses numerals 0, 1, 2, 4, 5, 6, and 7 or 0 1 2 3 4 5 6 7

The Decimal system uses all the numerals you are familiar with : 0 through 9 or 0 1 2 3 4 5 6 7 8 9

# Hexadecimal Numerals

The Hexadecimal system uses all the numerals of the Decimal system and also uses the letters A through F or 0 1 2 3 4 5 6 7 8 9 A B C D E F

# Roman Numerals

- roman numeral - old roman numerals.