Out of curiosity, I spent about a half hour researching.
I know what you mean but I could find absolutely nothing.
Of course you have the original programming punch cards from the early days of computing. And they were called just that.
Punch cards.
The only place I have seen that personally is for grading an S.A.T type test where you fill in the little circles.
They would have a punched "answer sheet" that they would lay over top of your work for grading purposes.
Along the way I noticed that there are a lot of more efficient and simpler ways to create/decipher secret messages.
I'm thinking this is something you experienced personally but not something that was ever in practical use.
Sorry, not much help I know.
Peace!
[–] 24187698? 0 points 2 points 2 points (+2|-0) ago
cipher key overlay