Noun

1. A finger or toe.
2. A numeral that can be combined with others to write larger numbers, and that cannot itself be split into other numerals.

   The digits of the decimal number system are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9, and those in the hexadecimal number system are those in the decimal system along with A, B, C, D, E and F.

   The number 2307 has four digits: the thousands digit is 2; the hundreds digit is 3; the tens digit is 0; and the units digit is 7.

3. One's phone number.

   That girl likes me — she gave me her digits.