E2, e2, E02, E.II, e or E-2 may refer to:

Science and technology

* E2 reaction, a type of

elimination reaction An elimination reaction is a type of organic reaction in which two substituents are removed from a molecule in either a one- or two-step mechanism. The one-step mechanism is known as the E2 reaction, and the two-step mechanism is known as the E1 r ...

* Honda E2, one of the predecessors of Honda's ASIMO robot * E2, a communications channel defined in the

E-carrier The E-carrier is a member of the series of carrier systems developed for digital transmission of many simultaneous telephone calls by time-division multiplexing. The European Conference of Postal and Telecommunications Administrations (CEPT) ori ...

standard * G₂ (mathematics) (old name E2 or E₂), a group *

E-2 process E is the fifth letter of the Latin alphabet. E or e may also refer to: Computing and computation * E (1970s text editor), a text editor developed at the Stanford AI Lab in the 1970s * E (complexity), a set of decision problems solvable by a ...

, an obsolete film developing method for photographic transparency film

Biology and medicine

Ubiquitin-conjugating enzyme Ubiquitin-conjugating enzymes, also known as E2 enzymes and more rarely as ''ubiquitin-carrier enzymes'', perform the second step in the ubiquitination reaction that targets a protein for degradation via the proteasome. The ubiquitination process ...

, a protein component of proteasome-mediated protein degradation * E2 regulatory sequence, for the insulin gene * Levuglandin E2, an aldehyde *

Prostaglandin E2 Prostaglandin E2 (PGE2), also known as dinoprostone, is a naturally occurring prostaglandin with oxytocic properties that is used as a medication. Dinoprostone is used in labor induction, bleeding after delivery, termination of pregnanc ...

, an abortifacient *

Prostaglandin E2 receptor The prostaglandin E2 (PGE2) receptors are G protein-coupled receptors that bind and are activated by prostaglandin E2. They are members of the prostaglandin receptors class of receptors and include the following Protein isoforms: * Prostaglan ...

, a human gene * Iodine-deficiency (ICD-10 code: E02) *

Estradiol Estradiol (E2), also called oestrogen, oestradiol, is an estrogen steroid hormone and the major female sex hormone. It is involved in the regulation of female reproductive cycles such as estrous and menstrual cycles. Estradiol is responsible ...

, 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) In cryptography, E2 is a symmetric block cipher which was created in 1998 by NTT and submitted to the AES competition. Like other AES candidates, E2 operates on blocks of 128 bits, using a key of 128, 192, or 256 bits. It uses a 12-round Feis ...

, a block cipher submitted to the AES competition by NTT *

Tungsten E2 The Tungsten series was Palm, Inc.'s line of business-class Palm OS-based PDAs. Details The Tungsten series was introduced in October 2002, created as a "prosumer" line priced at $199 to $300 to compete with the popular Sony Clie and Windo ...

, a business-class Palm OS-based handheld computer * Motorola ROKR E2, a smartphone *

Everything2 Everything2 (styled Everything2 or E2 for short) is a collaborative online community consisting of a database of interlinked user-submitted written material. E2 is moderated for quality, but has no formal policy on subject matter. Writing on E ...

, a collaborative web-based community consisting of a database of interlinked user-submitted written material

Arts and entertainment

* ''E'' (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) e2 was a Turkish television channel launched in January 2007 that often broadcasts American series. It is owned by the Doğuş Group. The ldents Logos File:E2 (2006-2011).png, 2006-2011 File:E2 logo (Turkish tv channel).png, 2011-2016 ...

, a Turkish TV channel *

e2 by SKY PerfecTV! is a direct broadcast satellite (DBS) service that provides satellite television, audio programming and interactive television services to households in Japan, owned by parent company SKY Perfect JSAT Corporation The SKY Perfect JSAT Group i ...

, a satellite television service in Japan operated by SKY Perfect

Transport

Air

Northrop Grumman E-2 Hawkeye The Northrop Grumman E-2 Hawkeye is an American all-weather, carrier-capable tactical airborne early warning (AEW) aircraft. This twin-turboprop aircraft was designed and developed during the late 1950s and early 1960s by the Grumman Aircraft ...

, 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 The Taylor Cub was originally designed by C. Gilbert Taylor as a small, light and simple utility aircraft, evolved from the Taylor Chummy. It is the forefather of the popular Piper J-3 Cub, and total production of the Cub series was 23,512 a ...

, a small, light and simple utility aircraft *

Embraer E-Jet E2 family The Embraer E-Jet E2 family is a series of four-abreast narrow-body airliners designed and produced by the Brazilian aircraft manufacturer Embraer. The twinjet is an incremental development of the original E-Jet family, adopting the more fuel ...

, an updated version of the E-jet family *

Eastman E-2 Sea Rover The Eastman E-2 Sea Rover, also called the Beasley-Eastman E-2 Sea Rover, was a light seaplane built in the late 1920s for business and shuttle use. Development The E-2 was designed by former Stout Metal Airplane Division of the Ford Motor Com ...

, a 1920s seaplane *

Eurowings Europe Eurowings Europe is a low-cost airline registered in Malta. Eurowings Europe operates and maintains aircraft used on flights that are scheduled, marketed and sold by its sister airline, the Germany based Eurowings. Both airlines are wholly own ...

(former IATA code: E2), an Austrian airline subsidiary of Lufthansa *

Kampuchea Airlines Kampuchea Airlines was an airline based in Phnom Penh, Cambodia, operating regional passenger services out of Phnom Penh International Airport. History Kampuchea Airlines was operating Boeing 737-200 jetliners and ATR 72 turboprops during the ear ...

(former IATA code: E2), a Cambodian airline

Rail

E2 Series Shinkansen The is a Japanese high-speed Shinkansen train type operated by East Japan Railway Company (JR East) on the Tohoku Shinkansen high-speed lines in Japan since 1997. They are formed in 8- and 10-car sets. The 8-car sets were used on the Hokuriku ...

, a Japanese high-speed train *

EMC E2 The EMC E2 was an American passenger-train diesel locomotive which as a single unit developed , from two (2) prime movers. These locomotives were typically operated as a unit set ( A - B - B) or ( A - B - A); where the three unit lashup deve ...

, an early American passenger-train diesel locomotive *

LB&SCR E2 class The London, Brighton and South Coast Railway (LB&SCR) E2 class was a class of steam locomotives designed by Lawson Billinton, intended for shunting and short distance goods trains. Ten examples were built between 1913 and 1916. Some of these ...

, 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) The Colombo Outer Circular Expressway (also known as the Outer Circular Highway (OCH), Colombo Inter-provincial Orbital Router or the Arthur C. Clarke Expressway) is a highway in Colombo, Sri Lanka. It was opened in sections. The long outer circ ...

, in Sri Lanka *

E2 European long distance path The E2 European long distance path or E2 path is a 4850 km (3010-mile) series of long-distance footpaths that is intended to run from Galway in Ireland to France's Mediterranean coast and currently runs through Scotland, England, Belgium, L ...

, a long-distance footpath that runs from Galway in Ireland to France's Mediterranean coast *

North–South Expressway Southern Route The North–South Expressway Southern Route () is an interstate controlled-access highway running parallel to the southwestern coast of Peninsular Malaysia. The expressway forms the south section of the North–South Expressway (Malaysia), North ...

(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'', an E-class submarine of the Royal Navy * 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 The E (Eastern) postcode area, also known as the London E postcode area, is the part of the London post town covering much of east London, England. It borders the N postcode area to the west, both north of the tidal Thames. Since closure of the ...

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 The Eternity II puzzle (E2 or E II) is an edge-matching puzzle launched on 28 July 2007. It was developed by Christopher Monckton and marketed and copyrighted by TOMY UK Ltd as a successor to the original Eternity puzzle. The puzzle was part o ...

, a puzzle competition * E-II Holdings, Inc., an investment holding company formerly owned by

Meshulam Riklis Meshulam Riklis (; 2 December 1923 – 25 January 2019) was an Israeli financier and businessman. Early years Born in Istanbul to a Russian-Jewish family, Riklis grew up in Tel Aviv, and attended the Herzliya Hebrew Gymnasium high school; bef ...

, and later by Carl Icahn * E2 grade, an assessment of difficulty in rock climbing