The Green Lantern symbol shirts that Sheldon wears on "The Big Bang Theory" have corresponding emotions in the comic universe:
red for rage,
blue for hope,
indigo for compassion and so on.The symbol on Sheldon's shirt is often a clue to his emotions in that scene.
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Things You Didn't Know About The Big Bang Theory
FanfictionHere are some mind-blowing facts that you probably didn't know about The Big Bang Theory.