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
  • 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, <math>E_1(z)= \int_1^\infty \frac{e^{-tz{t}\, {\rm d}t~</math>, 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 (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), 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)