[tshaddox]

I always think of the indexes in the back of books as the origin of the term in computing. The relationship to "index cards" never even occurred to me!

[kgwgk]

Index cards are not different from index entries in a book. Index is “indicator” or “pointer” in Latin (hence the name of the finger).

[tshaddox]

Yeah, I've got the vocab, I just never associated index cards with that use case because growing up we only ever used index cards for labeling, note-taking, arts and crafts, and flash cards.