# What does the expression $A^c$ mean in this context?

In a maths question, I had $A$ with a superscript of $c$, like this: $$A^c$$ What does this mean? In a Venn Diagram $A =$ to 5 and 6.

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is it complement? – Yimin Feb 16 '13 at 7:31
It is not a compliment. – William Feb 16 '13 at 7:33
It is not a compliment, but the question was whether it was a complement? – Gerry Myerson Feb 16 '13 at 11:20

$A^c$ means the complement of the set $A$. It is the set of all elements (in some universal set) that are not in $A$.

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It is the set of all elements that are not in A respect to A's universal set M. – Babak S. Feb 16 '13 at 7:33
Oh. THANK YOU. You saved a lot of marks in my grade :D – William Feb 16 '13 at 7:34
@William your two comments are in diverge :) – Kaster Feb 16 '13 at 8:06