Editing E2

'''E2''', '''e2''', '''E02''', '''E.II''', '''e'''{{sup|2}} or '''E-2''' may refer to:
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==Science and technology==
* E2 reaction, a type of [[elimination reaction#E2 mechanism|elimination reaction]]
* [[Honda E2]], one of the predecessors of Honda's ASIMO robot
* E2, a communications channel defined in the [[E-carrier]] standard
* [[G2 (mathematics)|G<sub>2</sub> (mathematics)]] (old name E2 or E<sub>2</sub>), a group
* [[E-2 process]], an obsolete film developing method for photographic transparency film

===Biology and medicine===
* [[Ubiquitin-conjugating enzyme]], a protein component of proteasome-mediated protein degradation
* [[E2 regulatory sequence]], for the insulin gene
* [[Levuglandin E2]], an aldehyde
* [[Prostaglandin E2]], an abortifacient
* [[Prostaglandin E2 receptor]], a human gene
* [[Iodine-deficiency]] (ICD-10 code: E02)
* [[Estradiol]], an estrogen steroid hormone
* [[Dihydrolipoyl transacetylase]], the second element of the multienzyme pyruvate dehydrogenase complex
* [[Acireductone dioxygenase (iron(II)-requiring)]], an enzyme
* [[Haplogroup E2 (Y-DNA)]], a human Y-chromosome DNA haplogroup

===Computing===
* [[E2 (cipher)]], a block cipher submitted to the AES competition by NTT
* [[Tungsten E2]], a business-class Palm OS-based handheld computer
* [[Motorola ROKR E2]], a smartphone
* [[Everything2]], a collaborative web-based community consisting of a database of interlinked user-submitted written material

==Arts and entertainment==
* [[E² (album)|''E{{sup|2}}'' (album)]], a 2007 album by Eros Ramazzotti

===Television===
* "[[E²]]", an episode of ''Star Trek: Enterprise''
* ''[[MTV e2]]'', a Canadian entertainment news program that airs on MTV Canada
* [[E2 (TV channel)]], a Turkish TV channel
* [[e2 by SKY PerfecTV!]], a satellite television service in Japan operated by SKY Perfect

==Transport==
===Air===
* [[Northrop Grumman E-2 Hawkeye]], an American carrier-based AWACS aircraft 
* [[Fokker E.II]], a 1915 German single-seat monoplane fighter aircraft
* [[Pfalz E.II]], a German aircraft powered by the Oberursel U.I engine
* [[Taylor E-2]], a small, light and simple utility aircraft
* [[Embraer E-Jet E2 family]], an updated version of the E-jet family
* [[Eastman E-2 Sea Rover]], a 1920s seaplane
* [[Eurowings Europe]] (former IATA code: E2), an Austrian airline subsidiary of Lufthansa
* [[Kampuchea Airlines]] (former IATA code: E2), a Cambodian airline

===Rail===
* [[E2 Series Shinkansen]], a Japanese high-speed train
* [[EMC E2]], an early American passenger-train diesel locomotive
* [[LB&SCR E2 class]], a class of 0-6-0T steam locomotives designed by Lawson Billington
* [[PRR E2]], an American PRR 4-4-2 locomotive
* [[CNW Class E-2]], a class of 4-6-2 steam locomotives built by the American Locomotive Company in 1923

===Roads and footpaths===
* [[E02 expressway (Sri Lanka)]], in Sri Lanka
* [[E2 European long distance path]], a long-distance footpath that runs from Galway in Ireland to France's Mediterranean coast
* [[North–South Expressway Southern Route]] (E2), in Malaysia
* [[European route E002]], in Azerbaijan and Armenia
* [[E2 expressway (Philippines)]], expressway route in the Philippines
* [[San'yō Expressway]], Hiroshiwa-Iwakuni Road, Ogori Road and Yamaguchi-Ube Road, numbered as E2 in Japan

===Submarines===
* [[HMS E2|HMS ''E2'']], an E-class submarine of the Royal Navy
* [[USS E-2|USS ''E-2'']], an E-class submarine of the US Navy

===Other transport===
* [[London Buses route E2]], England

==Other uses==
* [[E-2 visa]], a type of US visa
* E2, a postcode district in the [[E postcode area]] for east London, England
* [[Private E-2]], a pay grade for the rank of Private in the US Army
* [[E2 (nightclub)]], a nightclub in Chicago, US
* [[Eternity II puzzle]], a puzzle competition
* E-II Holdings, Inc., an investment holding company formerly owned by [[Meshulam Riklis]], and later by Carl Icahn
* E2 grade, an [[grade (climbing)#Adjectival grade|assessment of difficulty]] in rock climbing

==See also==
* E2c, earphones by [[Shure]]
* [[2E (disambiguation)]]
* [[EII (disambiguation)]]

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