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

Biology and medicine [link]

• 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

Mathematics and technology [link]

• 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)

Entertainment [link]

• e2 (series), a documentary television series broadcast by PBS
• "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

Transport [link]

Aircraft [link]

• E-2 Hawkeye, a carrier-based AWACS aircraft of the United States Navy
• 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

Rail [link]

• 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

Roads and footpaths [link]

• 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

Submarines [link]

• 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 [link]

• Kampuchea Airlines IATA code
• London Buses route E2

Other uses [link]

• 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
• The E2 postcode district
• 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.

See also [link]

• 2E (disambiguation)

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