Where does the HERO come from in this name?
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his name was Hero (or Heron) of Alexandria
http://en.wikipedia.org/wiki/Hero_of_Ale…
http://en.wikipedia.org/wiki/Hero_of_Ale…
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If your question is why are all letters of HERO capitalized, the answer is that it isn't required since it is not an acronymn. It was named after a person in antiquity. Often is is spelled Hero.:
http://physics.kenyon.edu/EarlyApparatus…
http://physics.kenyon.edu/EarlyApparatus…