E1, E01, E.I or E-1 may refer to:

Transportation

Aircraft

* Azcárate E-1, a Mexican sesquiplane trainer * Fokker E.I, a German fighter aircraft * Grumman E-1 Tracer, an American airborne early warning aircraft * Hydra Technologies E1 Gavilán, a hand-launched Mexican unmanned electronic surveillance drone * Junkers E.I, the Idflieg designation for the 1916 Junkers J1 monoplane * LVG E.I, a 1915 German two-seat monoplane * NFW E.I, a 1917 German monoplane fighter * Pfalz E.I, a Morane-Saulnier H monoplane built under licence for Germany * Siemens-Schuckert E.I, a 1915 German single seat monoplane * Standard E-1, a 1917 early American Army fighter aircraft

Automobiles

BMW E1 BMW E1 is the name of two electric car, electric/hybrid electric car, hybrid city car concept car, concepts by Germany, German automobile manufacturer BMW, revealed at the 1991 then 1993 International Motor Show Germany. First generation (Z11; 19 ...

, a 1991 and 1993 German electric/hybrid city car concept * BYD e1, a 2019–present Chinese electric city car * Dongfeng Fengguang E1, a 2019–present Chinese electric mini crossover * Haima E1, a 2020–present Chinese electric city car * Roewe E1, a 2012 Chinese electric city car concept later produced as the Roewe E50 * E1, a Mazda E type piston engine * Switch E1, a bus Built by Switch Mobility * Bestune E01, a compact electric crossover

Submarines

* HMS ''E1'', an E-class submarine of the Royal Navy * USS ''E-1'' (SS-24), a 1917 E-class submarine of the United States Navy

Roads

* European route E1, from Northern Ireland to Spain * E1 European long distance path, a long-distance hiking route from Norway to Italy * London Buses route E1, a transport for London contracted bus route *

Tomei Expressway Tomei may refer to: People with the surname Tomei, which is an Italian version of Thomas (surname), Thomas *Bernardo Tomei (born 1933), Italian ice hockey player *Carolyn Tomei (born 1936), Democratic politician from the US state of Oregon *Concett ...

and Meishin Expressway, route E1 in Japan * North–South Expressway Northern Route and New Klang Valley Expressway, route E1 in Malaysia * E1 expressway (Philippines) ( North Luzon Expressway, Subic–Clark–Tarlac Expressway, and Tarlac–Pangasinan–La Union Expressway), expressway route in the Philippines * E1 expressway (Pakistan) * E01, Southern Expressway in Sri Lanka

Trains and locomotives

* E1 Series Shinkansen, a Japanese high-speed train * Bavarian E I, a German steam engines locomotive model * EMC E1, a diesel locomotive * LB&SCR E1 class, an 1874 British 0-6-0 steam locomotive * NCC Class E1, a Northern Counties Committee Irish steam locomotive * NER Class E1, an 1898 class of small 0-6-0T steam locomotive * PRR E1, an American PRR 4-4-2 steam locomotive * SP&S Class E-1, a 1934 steam locomotives class

Science and mathematics

Biochemistry

* E1 (HCV), a viral structural protein found in hepatitis C * E1, a unimolecular elimination mechanism in organic chemistry * E1-enzymes, also known as Ubiquitin-activating enzymes, an enzyme which catalyzes the first step in the ubiquitination reaction, which targets a protein for degradation via a proteasome] *

E1 regulatory sequence Transcription (biology), 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 ...

for the insulin gene * Estrone, a hormone * Pyruvate dehydrogenase (E1), the first component enzyme of pyruvate dehydrogenase complex * Acireductone synthase, an enzyme * Haplogroup E1 (Y-DNA), a human Y-chromosome DNA haplogroup

Mathematics

* Exponential integral,

E_1(z)= \int_1^\infty \frac\, t~

, mathematical function * the E1 series (number series) of preferred numbers

Medicine

* E1-isoprostane, a type of isoprostane

Businesses and organizations

E1 Music MNRK Music Group (pronounced "monarch"), formerly known as Koch Records and Entertainment One (eOne) Music/Records, is an American independent record label and music management company based in New York City. It was formed in 1987 as a music div ...

, an independent record label in the United States * E1 Corp., a Korean chemical and oil company, member of the LS Group * Entertainment One, an international media company

Electronics

* Honda E1, a predecessor of the ASIMO humanoid robot * Olympus E-1, a digital single-lens reflex camera

Places

* E1 (Jerusalem), an area east of Jerusalem in the West Bank * E1 postcode district, London, England, United Kingdom

Other uses

* E01, ECO code for the closed variation of the Catalan Opening in chess * E01, the Encase Image File Format * E-1 (rank), the pay grade for enlisted ranks of Private, Airman Basic, and Seaman Recruit in the United States Military * E1 grade, a difficulty level in rock climbing *

E-1 (rocket engine) Rocketdyne's E-1 was a liquid propellant rocket engine originally built as a backup design for the Titan I missile. While it was being developed, Heinz-Hermann Koelle at the Army Ballistic Missile Agency (ABMA) selected it as the primary engine for ...

, a liquid propellant rocket engine * E1 carrier, an E-carrier European telecommunications standard * E1, an AMD CPU from the Bobcat (microarchitecture) family * E1, abbreviation for the Oracle JD Edwards EnterpriseOne software * E1 on Gardiner's sign list, representing the bull