Numerical digit

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A numerical digit (often shortened to just digit) is a single symbol used to represent numbers in positional notation, such as 0, 1, ..., 9 in the common base 10. The name "digit" originates from the Latin digiti, meaning fingers. Digits may be used alone (such as "1") or in combinations (such as in "15") to form a numeral. For any numeral system with an integer base, the number of different digits required is the absolute value of the base. For example, decimal (base 10) requires ten digits (0 to 9), and binary (base 2) requires only two digits (0 and 1). Bases greater than 10 require more than 10 digits, for instance hexadecimal (base 16) requires 16 digits (usually 0 to 9 and A to F).

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