
1) Audio storage
Found on
https://www.crosswordclues.com/clue/j-card

A j-card is the paper card inserted in the plastic storage case of most pre-recorded audio cassette releases, as well as cassettes of bootleg or copied concerts of the jam band scene. The j-card usually contains an image of the album cover, a track listing, credits, and copyright information. The j-card gets its name from being folded into the sha...
Found on
http://en.wikipedia.org/wiki/J-card

A blister pack with a j-shaped notch in the top, designed to hang on a peg for display. The j-shaped notch allows figures from the back of the peg to be removed without removing all the figures in front.
Found on
http://www.oafe.net/articulation/terms.php
No exact match found.