English edit

 
Shell and back of J-card for a Soviet (Russian) 45-minute cassette tape.

Etymology edit

From its shape when folded into the case, resembling a squared-off letter J.

Noun edit

J-card (plural J-cards)

  1. A printed card designed to fit in an audio cassette case, folded around the cassette, and usually bearing the title, artwork, track listing, etc.