E1

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, 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 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
• Ceylon Government Railway E1, a steam locomotive
• 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 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, $E_{1}(z)=\int _{1}^{\infty }{\frac {e^{-tz}}{t}}\,{\rm {d}}t~$, 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, 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 (West Bank), 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), 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
• E1 Series (boat racing), an international powerboat racing series

See also

• List of highways numbered 1
• 1E (disambiguation)