EI

EI or Ei may refer to:

• Aer Lingus (IATA code: EI), the flag airline of Ireland
• "E.I." (song), a single by Nelly
• E/I (educational and informative), a type of children's television programming shown in the United States
• Ei, an abbreviation for the binary prefix exbi
• Ei, a digraph found in some Latin alphabets
• Ei (album), an album by Maija Vilkkumaa
  • "Ei" (song), its first single
• Ei, Kagoshima, a town located in Ibusuki District, Kagoshima, Japan
• The Earth Institute, a collection of research centers at Columbia University
• Earth Interactions, a scientific journal published by the American Meteorological Society, American Geophysical Union, and Association of American Geographers
• Education Index, a United Nations measure of the level of educational development in a country
• Education International, a global union federation of teachers' trade unions
• Eerie, Indiana, an American television series
• Electron ionization, an ionization method in which energetic electrons interact with gas phase atoms or molecules to produce ions
• Electronic ignition, a variety of modern ignition system
• The Electronic Intifada, a not-for-profit, independent online publication which covers the Israeli-Palestinian conflict from a Palestinian perspective
• Emerald Isle, North Carolina, a town in Carteret County, North Carolina, United States
• Emotional intelligence, the ability, capacity, or skill to identify, assess, and control the emotions of oneself, of others, and of groups
• Employment insurance, the unemployment benefits system of Canada
• Encyclopaedia of Islam, an encyclopaedia of the academic discipline of Islamic studies
• Energy Institute, the main professional organization for the energy industry within the UK
• Engineer intern, an intermediary step to becoming a Professional Engineer
• Enrique Iglesias, Spanish pop music singer-songwriter
• Enterprise Ireland, the Irish leading state economic development agency
• Environmental illness (Multiple chemical sensitivity), a chronic medical condition characterized by symptoms that the affected person attributes to exposure to low levels of chemicals
• Equine influenza, the disease caused by strains of Influenza A that are enzootic in horse species
• Ex infra, a Latin phrase meaning 'from below'
• Expeditors International, the global logistics and freight forwarding company based out of Seattle, Washington
• Exponential integral, a special function defined on the complex plane given the symbol Ei
• Exposure index, the film speed rating of photographic film as exposed
• Extreme ironing, an extreme sport and a performance art
• Ionization energy (E_I), the energy required to remove one electron from one atom to another