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Published 09:58 12 May 2017 BST
It's actually a Kryptonite symbol meaning “hope” as well as Superman's family Crest from his home planet Krypton.
Comic book nerds know it as the insignia of the House of El, with its resemblance to a letter S being merely a coincidence.
The Sun reports that in 2003, DC Comics writer Mark Waid wrote a story entitled Superman: Birthright.
In it, he explains that Superman adopts the logo when he learns it is a symbol for a better tomorrow.
Now all you have to do is sit on that information and hope it comes up in a table quiz at some stage in the future.

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