[HPsquared]

I guess base-10 is still "digital", in that it works with digits.

[jazzyjackson]

remember bits are binary digits

I guess a decimal digit would be a dit

digital is simply discrete, as opposed to analog / continuous

[thesz]

  digit
  late Middle English: from Latin digitus ‘finger, toe’; digit (sense 1) arose from the practice of counting on the fingers.

"Digit" is the decimal digit.