**Number Systems**: How many digits are used in the number system

Examples:

• The decimal number system that we use every day has 10 digits {0,1,2,3,4,5,6,7,8,9} and so the radix is 10 (also called Base 10).

• Binary digits can only be 0 or 1, so the radix is 2 (or Base 2).

**Exponents (Powers)**: the number that is going to be raised to a power.

Example: in 8^{2}, 8 is the radix (more commonly called the base)

See: Base (numbers)