What does Pepsi mean?

Originally Pep-Cola, PEP from Peptic as it was meant to cure stomach ache.

With time Pepsy or Pepsi sounded more pleasing.

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PEPSI

I think, you should just reverse the logo, you can see this:

the logo is some how like yin yang symbol, pepsi shown up: IS DED.

so i think the logo of pepsi means:

yin yang is ded!