From over at Serious Eats, an article on decoding PLU stickers.
It turns out that there is more there, there, then you might immediately infer. For example:
Conventional produce gets a four-digit number. Organic produce gets a five-digit number that starts with 9. Genetically modified items also get a five-digit code, but that code starts with 8.
4139: Conventional Granny Smith apple
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