A two-year-old I know (okay, live with) proved something today.
He looked at this cover
and knew who that silhouette is. Granted it's possible he somehow remembers that the book does indeed involve the Man of Steel, but while he's seen the cover every so often, he's had relatively little exposure to the inside. (And though I don't expect there will be any question, no, he can't read.)
Batman may have a more iconic silhouette (maybe because he appears in it more often)...
...but fun to learn that Superman can hold his own.