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I absolutely hate that abbreviation. I just say materials.
What's your most-hated acronym or abbreviation?
My most hated is pots... but even I use it since I've been exposed to it for so many years.
"I'm making pots" - sounds like you're making cookware.
"bring pots!" - bring cookware to the dungeon
make a typo and forget the S "S> pot" - the police knock down your door.