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A numerical digit is a single symbol used alone or in combinations , to represent numbers in a positional numeral system. The name "digit" comes from the fact that the ten digits of the hands correspond to the ten symbols of the common base 10 numeral system, i.e. the decimal digits.
For a given numeral system with an integer base, the number of different digits required is given by the absolute value of the base. For example, the decimal system requires ten digits , whereas the binary system requires two digits.
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