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Radix (from Latin, basis) is the number base of a numeral system.
For example, binary is "base 2" and thus has a radix of 2. When describing radix in mathematical notation, the letter b is generally used as a symbol for this concept, so, for a binary system, b equals 2.
Another common way of expressing the radix is writing it as a subscript after the number that is being represented. 11110112 implies that the number 1111011 is a base 2 number, equal to 12310 (a decimal notation representation), 1738 (octal) and 7B16 (hexadecimal). When using the written abbreviations of number bases, the radix is not printed: Bin 1111011 is the same as 11110112.