The story
Short for biaxially-oriented polyethylene terephthalate.
Etymology from Wiktionary, CC BY-SA 4.0.
Today it means: A polyester film made from stretched polyethylene terephthalate (PET); mylar Full definition →
Short for biaxially-oriented polyethylene terephthalate.
Etymology from Wiktionary, CC BY-SA 4.0.