One wonders, what exactly makes a person "superhuman"? What if you're just 5% better than the mean? 10%?

Does the label "human" encompass all of the variations? Does an IQ in the top 1-2% of a nation make somebody "superhuman"?

(I originally wrote an overly long post full of personal anecdotes recalling the pain of being smart and different, but thought these questions added more).