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Hexadecimal (also known as base-16 or simply hex) is a positional numeral system that represents numbers using a radix (base) of sixteen. Unlike the decimal system representing numbers using ten symbols, hexadecimal uses sixteen distinct symbols, most often the symbols "0"–"9" to represent values 0 to 9 and "A"–"F" to represent values from ten to fifteen.
The phrase per mille (from Latin per mīlle ' in each thousand ') [1] indicates parts per thousand. [2] The associated symbol is ‰, similar to a per cent sign % but with an extra zero in the divisor.