English

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A J-card in its case.
 
An illustration demonstrating the resemblance to the letter J.

Etymology

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

Noun

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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.