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RichardKennaway comments on Yet More "Stupid" Questions - Less Wrong Discussion
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Universal Product Code.
International Article Numbers.
I don't know how widely they're used, and they're generally not as consumer-visible as ISBNs for books. The iPad I recently bought has a UPC barcode on the box, but not on the machine itself, and I've never had occasion to use a UPC or EAN to look something up.