E2, e2, E02, E.II, e2 or E-2 may refer to:
Biology and medicine
- Ubiquitin-conjugating enzyme, a protein component of proteasome-mediated protein degradation
- E2 regulatory sequence for the insulin gene
- Levuglandin E2
- Prostaglandin E2, an abortifacient
- Prostaglandin E2 receptor, a human gene
- E02 : Subclinical iodine-deficiency hypothyroidism ICD-10 code
- Estradiol (Oestradiol)
- Dihydrolipoyl transacetylase, the second element of the multienzyme pyruvate dehydrogenase complex
- Acireductone dioxygenase (iron(II)-requiring), an enzyme
Mathematics and technology
- E2 (cipher), a block cipher submitted to the AES competition by NTT
- E2 reaction, a type of organic reaction
- Honda E2, one of the predecessors of Honda's ASIMO robot
- Motorola ROKR E2, a smartphone
- Tungsten E2, a business-class Palm OS-based handheld computer
- E2, a communications channel defined in the E-carrier standard
- Shure E2 (sometimes called E2c) canalphones
- Everything2, a collaborative web-based community consisting of a database of interlinked user-submitted written material
- E2 or E2 is an old name for the exceptional group G2 (mathematics)
Music
- E2 (album), a 2007 album by Eros Ramazzotti
Television
- "E²", an episode of Star Trek: Enterprise
- e2 visa, E2 investor visa is a non-immigrant visa for investors, entrepreneurs, and those who want to run a business in the United States.
- 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
Aircraft
- 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
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. Also the basis for Thomas the Tank Engine.
- 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, Colombo–Katunayake Expressway in Sri Lanka
- E2 European long distance path, a long-distance footpath that runs from Galway in Ireland to France's Mediterranean coast
- E2, the North–South Expressway Southern Route in Malaysia
- E002, a European B-class route in Azerbaijan and Armenia
- E2 expressway (Philippines), expressway route in the Philippines, which includes Metro Manila Skyway, South Luzon Expressway, and Southern Tagalog Arterial Road
- Sanyo Expressway, Hiroshiwa-Iwakuni Road, Ogori Road and Yamaguchi-Ube Road, route E2 in Japan.
Submarines
- HMS E2, an E-class submarine of the Royal Navy
- USS E-2 (SS-25), an E-class submarine of the United States Navy
Other transport-related
- Kampuchea Airlines IATA code
- London Buses route E2
Other uses
- E-2 visa, a type of visa which allows an individual to enter and work in the United States based on an investment he or she will be controlling, while inside the United States
- E-2 South Korean visa, a South Korean language teaching visa
- E2, a postcode district in the E postcode area for east London
- Private E-2, a paygrade for the rank of Private in the U.S. Army
- E2 (nightclub), a nightclub in Chicago
- 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 assessment of difficulty in rock climbing
- E2 elimination, a mechanism of Elimination reaction in chemistry.
- Haplogroup E2 (Y-DNA), a human Y-chromosome DNA haplogroup
See also
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