dig·it 
(dĭjĭt)
(dĭjĭt)n.
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.
4. digits Slang A telephone number: She gave me her digits, and I put them in my cell phone.
[Middle English, from Latin digitus, finger, toe; see deik- in the Appendix of Indo-European roots.]