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numerical digit
A digit is a numeric symbol (such as "2" or "5") used in combinations (such as "25") to represent numbers (such as the number 25) in positional numeral systems. The name "digit" comes from the fact that the 10 digits (ancient Latin ''digiti'' meaning fingers)〔(【引用サイトリンク】title="Digit" Origin )〕 of the hands correspond to the 10 symbols of the common base 10 numeral system, i.e. the decimal (ancient Latin adjective ''decem'' meaning ten)〔(【引用サイトリンク】title="Decimal" Origin )〕 digits.
In a given numeral system, if the base be an integer, the number of digits required would always equal to the absolute value of the base. For example, the decimal system (base 10) has ten digits (0 through to 9), whereas binary (base 2) has two digits (0 and 1).
==Overview==
In a basic digital system, a numeral is a sequence of digits, which may be of arbitrary length. Each position in the sequence has a place value, and each digit has a value. The value of the numeral is computed by multiplying each digit in the sequence by its place value, and summing the results.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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