To complete the picture, you might've been taught a completely different mnemonic in other countries. The one I was taught was BODMAS ( "B"rackets, "O"f or "O"rder, "D"ivision, "M"ultiplication, "A"ddition and "S"ubtraction) and some African countries teach this as BIDMAS [0]. Caused a lot of confusion when I came to the US and drew a blank when someone mentioned PEMDAS in an example.

[0]: https://en.wikipedia.org/wiki/Order_of_operations#Mnemonics