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Superman's iconic 'S' symbol stands for the Kryptonian symbol for hope,
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but when inverted it also stands for resurrection.
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This concept is tied to Superman's death
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and resurrection in the iconic Death of Superman story
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and was prophesied by Krypton itself
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when Superman sought out the remaining Kryptonians and gave them his symbol.
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The symbol was created by Superman when he took on the name Superboy
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and was later retconned to have been given to him by his parents as a symbol of hope.
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Hence, it stands for hope, heroism, and resurrection.
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