E2

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

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)

"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
E² (album), a 2007 album by Eros Ramazzotti

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

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, route E2 in Japan.

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.