Actually, there is no such thing. You may be thinking of PEMDAS, which is the abbreviation for the order of operations in math.
P stands for Parentheses
E stands for Exponents
M stands for multiplication and D stands for dividing. If there are both of these operations in the problem, do them from left to right.
A stands for Addition, and S stands for Subtraction. Same rules for multiplying and dividing.
Starting with P, you would go down the list of letters when solving a multi operation problem. <3 I hope I helped!!