digit

The word 'digit' entered English in the late 14th century from Latin digitus, meaning "finger or toe." The Latin term is believed to derive from the Proto-Indo-European root deik-, meaning "to show" or "to point out," a logical connection given the primary function of fingers. The mathematical sense, referring to the numerals 0 through 9, arose in the 15th century, based on the ancient practice of counting on one's fingers. Thus, the word's journey from a physical pointer to a fundamental unit of numerical representation elegantly captures the evolution of human counting systems.

The word 'digit' is a simplex loanword from Latin. It does not contain separable morphemes in its modern English spelling.