H2

H2 can mean:

molecular hydrogen
H2 (manga)
the IATA code for Sky Airline
A modelname for a Hummer, see H2 (Hummer)
Harrison Number Two, an 18th century chronometer designed by John Harrison
H₂ histamine receptor
Hollywood Squares - This as a matter of fact was the abbreviation/nickname used for the final two seasons (2002-2004) seasons of the Tom Bergeron version.
In the U.S., a visa (document) issued for temporary non-agricultural employment

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