# 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 $A$.