"digit" in the noun sense
1. digit, figure
one of the elements that collectively form a system of numeration
"0 and 1 are digits"
2. finger, fingerbreadth, finger's breadth, digit
the length of breadth of a finger used as a linear measure
3. digit, dactyl
a finger or toe in human beings or corresponding body part in other vertebrates
Source: WordNet® (An amazing lexical database of English)
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