punchcard, what we used to communicate with computers back when dinosaurs still roamed the earth.
I came across it recently while checking some facts for my series on Shaker sites. I found it hiding between the pages of The People Called Shakers by Edward Deming Andrews. Inside the front cover was a return address sticker we'd used to identify ownership of the book. It listed the address of the house we rented while I was a graduate student. Back when dinosaurs roamed the earth.