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

Transportation

Aircraft

* Azcárate E-1, a Mexican sesquiplane trainer *

Fokker E.I The Fokker E.I was the first fighter aircraft to enter service with the Fliegertruppe of the Deutsches Heer in World War I. Its arrival at the front in mid-1915 marked the start of a period known as the " Fokker Scourge" during which the E.I a ...

, 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 The LVG E.I was a German two-seat monoplane of World War I. The E.I was unusual among monoplanes of its time in that it featured ailerons as opposed to the then-conventional (for monoplanes) wing warping Wing warping was an early system for l ...

, a 1915 German two-seat monoplane *

NFW E.I The NFW E.I was a prototype fighter aircraft built in Germany during World War I. Design The E.I was an all-wood single-seat monoplane powered by an Oberursel U.0 Oberursel (Taunus) () is a town in Germany and part of the Frankfurt Rhein-M ...

, a 1917 German monoplane fighter * Pfalz E.I, a Morane-Saulnier H monoplane built under licence for Germany *

Siemens-Schuckert E.I __NOTOC__ The Siemens-Schuckert E.I was a German fighter aircraft, manufactured by Siemens-Schuckert. The E type (Eindecker) monoplane first flew in late 1915. it was a monoplane with wire braced wings. powered by the Siemens-Halske Sh.I rotar ...

, 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/hybrid city car concepts by German automobile manufacturer BMW, revealed at the 1991 then 1993 International Motor Show Germany. First generation (Z11; 1991) The first-generation BMW E1 prototype, the Z11, w ...

, 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, a 2012 Chinese electric city car concept * E1, a Mazda E type piston engine

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

* E01, Southern Expressway in Sri Lanka * European route E01, 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 and Meishin Expressway, route E1 in Japan *

North–South Expressway Northern Route The North–South Expressway Northern Route is an interstate controlled-access highway running parallel to the northwestern coast of Peninsular Malaysia. The expressway forms the north section of the North–South Expressway, passing thro ...

and

New Klang Valley Expressway The New Klang Valley Expressway (NKVE), designated E1, is a controlled-access highway located entirely within the Klang Valley region of Selangor and Kuala Lumpur in Peninsular Malaysia. The expressway begins at the settlement of Bukit Raja n ...

, route E1 in Malaysia * E1 expressway (Philippines) (

North Luzon Expressway The North Luzon Expressway (NLEX), signed as E1 of the Philippine expressway network, partially as N160 of the Philippine highway network, and R-8 of the Metro Manila arterial road network, is a limited-access toll expressway that connects ...

, Subic–Clark–Tarlac Expressway, and

Tarlac–Pangasinan–La Union Expressway The Tarlac–Pangasinan–La Union Expressway (TPLEX), signed as E1 of the Philippine expressway network and R-8 of the Metro Manila arterial road network, is a controlled-access toll expressway that connects the Central Luzon region with the ...

), expressway route in the Philippines * E1 expressway (Pakistan)

Trains and locomotives

E1 Series Shinkansen The was a high-speed Shinkansen train type operated by East Japan Railway Company (JR East) in Japan from July 1994 until September 2012. They were the first double-deck trains built for Japan's Shinkansen. They were generally, along with their ...

, a Japanese high-speed train * Bavarian E I, a German steam engines locomotive model * EMC E1, a diesel locomotive *

LB&SCR E1 class The London, Brighton and South Coast Railway E1 Class were steam locomotives designed by William Stroudley in 1874 for short-distance goods and piloting duties. They were originally classified E, and generally known as "E-tanks"; They were recla ...

, 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 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) In human genetics, Haplogroup E-P147 is a human Y-chromosome DNA haplogroup. Haplogroup E-P147, along with the less common Haplogroup E-M75, is one of the two main branches of the older Haplogroup E-M96. The E-P147 clade is commonly observed thro ...

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

Entertainment One Entertainment One Ltd., trading as eOne, is an American-owned Canadian multinational entertainment company. Based in Toronto, Ontario, the company is primarily involved in the acquisition, distribution, and production of films and television s ...

, 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 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 ...

, 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 f ...

, a liquid propellant rocket engine * E1 carrier, an

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) or ...

European telecommunications standard * E1, an AMD CPU from the Bobcat (microarchitecture) family