First of all, its PEMDAS.
And its:
-Parenthesis.
-exponent.
-multiplication.
-division.
-addition.
-subtraction.
A letter in math can stand for any number
Math is an abbreviation of mathematics: it is not an acronym. So the h does not stand for anything!
inches
Centigrams
decigram
Abbreviation.
the letter L can stand for a variable.
multiplication
it stands for milligrams
grams or gallon
multiply
An unknown number.