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

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 Transcription of insulin is regulated by the binding of various transcription factors to the ~400 base pairs before the insulin transcription start site, called the "insulin regulatory sequence". This sequence is made up of several distinct region ...

for the insulin gene * Levuglandin E2 * Prostaglandin E2, 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: * Prostaglandi ...

, a human gene * E02 : Subclinical

iodine-deficiency Iodine deficiency is a lack of the mineral (nutrient), trace element iodine, an essential nutrient in the diet (nutrition), diet. It may result in metabolic problems such as goiter, sometimes as an endemic goiter as well as congenital iodine defi ...

hypothyroidism ICD-10 code *

Estradiol Estradiol (E2), also spelled oestradiol, is an estrogen steroid hormone and the major female sex hormone. It is involved in the regulation of the estrous and menstrual female reproductive cycles. Estradiol is responsible for the development o ...

(Oestradiol) *

Dihydrolipoyl transacetylase Dihydrolipoyl transacetylase (or dihydrolipoamide acetyltransferase) is an enzyme component of the multienzyme pyruvate dehydrogenase complex. The pyruvate dehydrogenase complex is responsible for the pyruvate decarboxylation step that links glyco ...

, the second element of the multienzyme pyruvate dehydrogenase complex *

Acireductone dioxygenase (iron(II)-requiring) Acireductone dioxygenase ron(II)-requiring'' () is an enzyme that catalyzes the chemical reaction :1,2-dihydroxy-5-(methylthio)pent-1-en-3-one + O2 \rightleftharpoons 4-(methylthio)-2-oxobutanoate + formate Thus, the two substrates of this en ...

, an enzyme

Mathematics and technology

* E2 (cipher), a block cipher submitted to the AES competition by NTT *

E2 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 ...

, a type of organic reaction * Honda E2, one of the predecessors of Honda's ASIMO robot * Motorola ROKR E2, a smartphone *

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 Windows M ...

, a business-class Palm OS-based handheld computer * 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 *

Shure Shure Incorporated is an American audio products corporation. It was founded by Sidney N. Shure in Chicago, Illinois, in 1925 as a supplier of radio parts kits. The company became a consumer and professional audio-electronics manufacturer of mi ...

E2 (sometimes called E2c) canalphones *

Everything2 Everything2 (styled Everything2 or E2 for short) is a collaborative World Wide Web, Web-based community consisting of a database of interlinked user-submitted written material. E2 is Moderation system, moderated for quality, but has no formal po ...

, 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) In mathematics, G2 is the name of three simple Lie groups (a complex form, a compact real form and a split real form), their Lie algebras \mathfrak_2, as well as some algebraic groups. They are the smallest of the five exceptional simple Lie gr ...

Music

* ''E'' (album), a 2007 album by Eros Ramazzotti

Television

* "

E² "E²" (pronounced "E-Squared") is the seventy-third episode of the American science fiction television series '' Star Trek: Enterprise'', the twenty-first episode of season three. It first aired on May 5, 2004, on the UPN network in the Unite ...

", 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) e2 was a Turkish television channel launched in January 2007 that often broadcasts American series. It is owned by the Doğuş Group. The channel closed on January 31, 2016. Entertainment programmes The following is an incomplete list of show ...

, 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. SKY PerfecTV! is also a direc ...

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

, 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 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 0-6-0 T steam locomotives designed by Lawson Billinton, intended for shunting and short distance freight trains. Ten examples were built between 1913 and 1916, and w ...

, a class of 0-6-0T steam locomotives designed by Lawson Billington. Also the basis for

Thomas the Tank Engine Thomas the Tank Engine is an anthropomorphised fictional tank locomotive in the British ''Railway Series'' books by Wilbert Awdry and his son, Christopher, published from 1945. He became the most popular and famous character in the series, ...

. * PRR E2, an American PRR 4-4-2 locomotive *

CNW Class E-2 The Chicago and North Western Railway's Class E-2 was a 4-6-2 "Pacific" type locomotive built by the American Locomotive Company in Schenectady, New York in 1923. Twelve were originally built, and all were later converted. Four of these locomot ...

, 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 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 Northern Ireland, Scotland, Eng ...

, a long-distance footpath that runs from Galway in Ireland to France's Mediterranean coast * E2, the

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, connecting the sta ...

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 Skyway, officially known as the Metro Manila Skyway System (MMSS), is an elevated highway which is the main expressway in Metro Manila, Philippines. It connects the North (NLEX) and South Luzon Expressways (SLEX) with access to Ninoy Aquino ...

South Luzon Expressway The South Luzon Expressway (SLEX), signed as E2 of the Philippine expressway network and R-3 of the Metro Manila arterial road network, is a limited-access toll expressway that connects Metro Manila to the provinces in the Calabarzon region ...

, and

Southern Tagalog Arterial Road The Southern Tagalog Arterial Road (STAR), commonly known as the STAR Tollway, is a two-to-four-lane controlled-access toll expressway in the province of Batangas in the Philippines. It is operated by STAR Infrastructure Development Corporati ...

Sanyo Expressway , stylized as SANYO, is a Japanese electronics company and formerly a member of the ''Fortune'' Global 500 whose headquarters was located in Moriguchi, Osaka prefecture, Japan. Sanyo had over 230 subsidiaries and affiliates, and was founded ...

, 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 This is a list of Transport for London (TfL) contracted bus routes in London, England, as well as commercial services that enter the Greater London area (except coaches). Bus services in London are operated by Abellio London, Arriva Londo ...

Other uses

E-2 visa The E-2 Investor Visa allows an individual to enter and work in the United States based on an investment in a U.S. business. The E2 visa is valid for three months to five years (depending on the country of origin) and can be extended indefinite ...

, 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 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 th ...

for east London * Private E-2, a paygrade for the rank of Private in the U.S. Army *

E2 (nightclub) The E2 nightclub stampede occurred on February 17, 2003, at the E2 nightclub above the Epitome restaurant at 2347 South Michigan Avenue in the South Loop neighborhood of Chicago, Illinois, in which 21 people died and more than 50 were injured wh ...

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

Meshulam Riklis Meshulam Riklis ( he, משולם ריקליס; 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 ...

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

in chemistry. *

Haplogroup E2 (Y-DNA) Haplogroup E-M75 is a human Y-chromosome DNA haplogroup. Along with haplogroup E-P147, it is one of the two main branches of the older haplogroup E-M96. Distribution Sorted frequency table of E-M75+ populations. Note that a "?" specifies that the ...

, a human Y-chromosome DNA haplogroup