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Octal games, a game numbering system used in combinatorial game theory; Split octal, a 16-bit octal notation used by the Heath Company, DEC and others; Squawk code, a 12-bit octal representation of Gillham code; Syllabic octal, an octal representation of 8-bit syllables used by English Electric
"A base is a natural number B whose powers (B multiplied by itself some number of times) are specially designated within a numerical system." [1]: 38 The term is not equivalent to radix, as it applies to all numerical notation systems (not just positional ones with a radix) and most systems of spoken numbers. [1]
Numbers written in different numeral systems. A numeral system is a writing system for expressing numbers; that is, a mathematical notation for representing numbers of a given set, using digits or other symbols in a consistent manner. The same sequence of symbols may represent different numbers in different numeral systems.
In the decimal system, there are 10 digits, 0 through 9, which combine to form numbers. In an octal system, there are only 8 digits, 0 through 7. That is, the value of an octal "10" is the same as a decimal "8", an octal "20" is a decimal "16", and so on.
So binary numbers are "base-2"; octal numbers are "base-8"; decimal numbers are "base-10"; and so on. ... The octal numbering system is also used as another way to ...
Pentadic numerals – Runic notation for presenting numbers; Senary numeral system (base 6) Septenary numeral system (base 7) Octal numeral system (base 8) Nonary (novenary) numeral system (base 9) Decimal (denary) numeral system (base 10) Bi-quinary coded decimal – Numeral encoding scheme; Negative base numeral system (base −10)
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Binary is also easily converted to the octal numeral system, since octal uses a radix of 8, which is a power of two (namely, 2 3, so it takes exactly three binary digits to represent an octal digit). The correspondence between octal and binary numerals is the same as for the first eight digits of hexadecimal in the table above.