digit

(dĭjˈĭt)

1. a. A human finger or toe.
   b. A corresponding part in other vertebrates.
2. A unit of length derived from the breadth of a finger and equal to about ³/₄ of an inch (2.0 centimeters).
3. a. One of the ten Arabic number symbols, 0 through 9.
   b. Such a symbol used in a system of numeration.