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They mean the Big Three in terms of Avengers. Overall, the big 3 is probably Spidey, Iron Man, and Wolverine.
Oh, that makes sense. I'd say their biggest 3 characters has probably changed over the years, but it's always included Spidey. Iron Man was definitely not one of them until his movie turned out so well (I always said he'd make a great movie hero). But now, yeah, you've probably picked the right three.