# Number - Base (or Radix)

### Table of Contents

## About

The radix or base ^{1)} is the number of unique digits, including zero, used to represent numbers in a positional numeral system.

## Example

### Decimal

For the decimal system the radix is ten, because it uses ten digits:

- 0
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9

### Binary

For the binary system the radix is 2, because it uses only two digits:

- 0
- 1

^{1)}