# octal

(redirected from Base 8)
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Related to Base 8: Base 9, Base 16

## octal

[′äkt·əl]
(mathematics)
Pertaining to the octal number system.

## octal

(mathematics)
Base 8. A number representation using the digits 0-7 only, with the right-most digit counting ones, the next counting multiples of 8, then 8^2 = 64, etc. For example, octal 177 is digital 127:

digit weight value 1 8^2 = 64 1* 64 = 64 7 8^1 = 8 7* 8 = 56 7 8^0 = 1 7* 1 = 7 --- 127

Octal system used to be widespread back when many computers used 6-bit bytes, as a 6-bit byte can be conveniently written as a two-digit octal number. Since nowadays a byte is almost always 8-bit long the octal system lost most of its appeal to the hexadecimal system.

For a brief discussion on the word `octal' see hexadecimal.

## octal

A numbering system that uses eight digits. It is used as a shorthand method for representing binary characters that use six-bits. Each three bits (half a character) is converted into a single octal digit. Okta is Greek for 8.

```Decimal  Binary   Octal
0        000      0
1        001      1
2        010      2
3        011      3
4        100      4
5        101      5
6        110      6
7        111      7
```
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