Latin 'digitus' (finger), from PIE *deyk- (to point) — numbers are 'digits' after the fingers we count on.
Relating to or using signals or information represented by discrete values (digits); involving or relating to computer technology.
From Latin 'digitālis' (of or pertaining to a finger), from 'digitus' (finger, toe, the breadth of a finger as a unit of measure), from PIE *deyḱ- (to show, to point, to indicate). Humans have always counted on their fingers — the ten 'digits' (fingers) gave their name first to the numbers 0–9, then to anything represented by those discrete numbers. The PIE root *deyḱ- produced
'Digital' literally means 'of the fingers.' We call computer technology 'digital' because it uses discrete numbers (digits), and we call numbers 'digits' because we counted them on our fingers (Latin digitus). The entire digital revolution is etymologically named after the ten fingers of the human hand