Anyone know approximately what font the “s” in the superman logo is?
Kryptonian, of course. 
Seriously, however, the “S” insignia has had several changes depending on the particular incarnation of Superman (time period, media [comic books, live action television, movies, etc.]). You’d probably have to specify which. Then I’ll let our comic book experts Fenris and cmkeller answer.
Zev Steinhardt
according to this font forum, the answer is “Mata”. But I don’t think that’s right. Perhaps they meant the full “Superman” title font, used on the covers.
you can browse here.
jb