Superman has been around for 75 years, portrayed by about a dozen actors in movies and TV shows, and thousands of illustrations in comic books and cartoons. That said, the Big Blue Boy Scout hasn’t changed much. What has changed, is the famous “S” on his chest.
The famous insignia, representing his family name on Krypton, has been through about 25 changes. Check them out below:

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I like the Last one best!!!! :O
The Electric Blue one is cool too!!! BO
What’s with the “smallville” one? Why an 8? Anybody know?
Hey Potato,
Great question. Here’s the answer:
The “8″ is the Kryptonian symbol for “air.” It’s also an infinity symbol rotated 90 degrees.
hey BL,whats the “kingdom come” one from?
Hey c10,
“Kingdom Come” is a very cool DC comics series that introduced an alternate version of Superman and several other DC characters. Take a look at this wikipedia page for more on Kingdom Come.” http://en.wikipedia.org/wiki/Superman_%28Kingdom_Come%29
another question BL, whats with the superman/batman combo.