Octal numeral system

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The octal numeral system is a place-value numeral system based on the powers of 8, sometimes used as a shorthand for the binary numeral system.

For example, 11001001 is 311:

$2^{7}$ $2^{6}$ $2^{5}$ $2^{4}$ $2^{3}$ $2^{2}$ $2^{1}$ $2^{0}$ 128s 64s 32s 16s 8s 4s 2s 1s 1 1 0 0 1 0 0 1 3 1 1 $8^{2}$ $8^{1}$ $8^{0}$

Compare hexadecimal.