In DC Comics’s Green Lantern, the Emotional Spectrum is a concept, in which the seven colors of the rainbow draw power from an emotion: love (violet), compassion (indigo), hope (blue), willpower (green), fear (yellow), avarice (orange) and rage (red). 
In Big Bang Theory, one of the theories surrounding Sheldon’s colour of the shirt gives us a clue to the mood of his on a particular day. 

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