It depends how its used, it could be used as the multiplication sign or it could be used simply as a variable and u need to solve what it is equal to. It has many meanings.
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An unknown number.
y 2 1 x 0 1 2
-iaminneed- it usually stands for a number.it also depends what kind of equation it is.
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!