digit - different meanings for digit by the grokitbetter visual dictionary

digit: 1: the length of breadth of a finger used as a linear measure; 2: one of the elements that collectively form a system of numeration; "0 and 1 are digits"; 3: a finger or toe in human beings or corresponding body part in other vertebrates

Click on the image of digit to see digit explained in context

Have a look at the legend to grok it better.