What is a digit?

   Digit is any one of the numerals O, 1, 2, 3, 4, 5, 6, 7, 8, and 9. Other numerals are formed by combinations of the ten digits. For example, the numeral 384 contains the digits 3, 8, and 4. The location of a digit in a numeral determines its value. In the numeral 111, for example, the first digit stands for 100, the second digit represents 10, and the third digit stands for 1. The ten digits are also commonly referred to as Arabic numerals.
   The term "digit" is sometimes used to refer to a number, rather than to the symbol for that number.