Symbols commonly seen on plastic goods identifying them as one of seven broad classes of plastics: 1 PETE, 2 HDPE, 3 PVC, 4 LDPE, 5 PP, 6 PS, 7 other. The order was chosen based on perceived difficulty of recycling these varieties of plastics, with 1 being the easiest.
Also called: pastic recycling codes
Puzzles
MIT Mystery Hunt 2023 The Junk Pile
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