E2

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

in biology or medicine

E2 regulatory sequence for the insulin gene
Prostaglandin E2 receptor, a human gene
E02 : Subclinical iodine-deficiency hypothyroidism ICD-10 code
Oestradiol
Dihydrolipoyl transacetylase, the second element of the multienzyme pyruvate dehydrogenase complex

in 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
Shure E2 (sometimes called E2c) canalphones
Everything2, a collaborative web-based community consisting of a database of interlinked user-submitted written material

In Entertainment:

Design e2, 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

In transportation:

roads

E 02 a European route from Galway to Nice
E2 (Zimbabwe), a road in Zimbabwe
North-South Expressway Southern Route in Malaysia

vehicles

E-2 Hawkeye, a carrier-based AWACS aircraft of the United States Navy
E2 Series Shinkansen, a Japanese high-speed train
EMD E2, an early American passenger-train diesel locomotive
European walking route E2, a long-distance footpath that runs from Galway in Ireland to France's Mediterranean coast
Fokker E.II, a 1915 German single-seat monoplane fighter aircraft
HMS E2, an E-class submarine of the Royal Navy
Kampuchea Airlines IATA code
LB&SCR E2 Class, a class of 0-6-0T steam locomotives designed by Lawson Billington
London Buses route E2
Pfalz E.II, a German aircraft powered by the Oberursel U.I engine
PRR E2, an American PRR 4-4-2 locomotive
Taylor E-2, a small, light and simple utility aircraft
USS E-2 (SS-25), an E-class submarine of the United States Navy
WLWR Class E2, a Waterford, Limerick and Western Railway Irish steam locomotive

In other fields:

E-2 South Korean visa, a South Korean language teaching visa
London E2, the postcode for Bethnal Green in London
Private E-2, the paygrade of the rank Private in the U.S. Army
E2 (nightclub), a nightclub in Chicago
an abbreviation for the second Eternity puzzle

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