Interpretation of a Question

Hi, this seems to me like a bit of a silly question, but I've had a problem in set theory given to me, and I'm having trouble working out exactly what it wants - the question word for word is;

Show that the set of all isomorphism classes of relations on has cardinality less than .

Am I right in taking these isomorphism classes as the sets containing relations and such that is isomorphic to , or is there some way that relations can themselves be isomorphic, and the isomorphism classes are actually just of isomorphic relations?

I hope the question is clear here!