An unknown number.
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-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!
A dot stands for multiplication simply because nothing else in math is a dot. Since X is a common math variable it is not used very often anymore in because it is too confusing when the problem looks like 3x x x + x= it is very hard to decipher.
Abbreviation.