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It means the same as in ordinary English.
The ordinary meaning of "common" is used in math too. It means "same for both" or "same for all".
In ordinary everyday letters . . . pi In Greek letters . . . Π
Twice a number would be written as 2x.
if this is a math question it means that you write every that is not in this 'a' the apostrophe means NOT IN but if A is as it self u write every thng In A