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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.
Like the decimal base 10, the base is a semiprime, though it is unique as the product of the only two consecutive numbers that are both prime (2 and 3). As six is a superior highly composite number , many of the arguments made in favor of the duodecimal system also apply to the senary system.
However, the decimality of the Russian abacus (explained by Russian ruble's being the world's first decimal currency) and its simplicity (compared to the previous European and Asian versions) led to the wide use of this device in Russia well until the advent of electronic calculators in the late 20th century, though it remains in quite common ...