H2

From Freepedia

H2 can mean:

• molecular hydrogen
• H2 (manga)
• A modelname for a Hummer, see H2 (Hummer)
• Harrison Number Two, a 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