I prefer "Please Excuse My Dear Aunt Sally"

P: Parentheses

E: Exponents

M: Multiplication

D: Division

A: Addition

S: Subtraction

In any case, mnemonics are to help you remember things you don'tunderstand. Understanding what you are doing is always better than memorizing rules. For example, you mnemonic has "D", division, before "M", multiplication while mine has them reversed. Do you understand why it doesn't matter?