H is the eighth letter in the Latin alphabet. Its name in both British and American English is spelled aitch (pronounced /e?t?/) in most dialects, though in Irish, Singaporean ...
http://en.wikipedia.org/wiki/H

Hydrogen (pronounced /?ha?dr?d??n/) is the chemical element with atomic number 1. It is represented by the symbol H. At standard temperature and pressure, hydrogen is a ...
http://en.wikipedia.org/wiki/Hydrogen

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Urban Dictionary is the dictionary you wrote. Define your world
http://www.urbandictionary.com/browse.php?character=H