Emotional intelligence

Ei, an abbreviation for the IEEE prefix exbi which represents 2⁶⁰.

EI, acronym for Engineer Intern, a probationary period lasting up to 5 years before an engineering graduate can become a Professional Engineer

Employment insurance, a Canadian government benefit

Education International, a global union federation

Enterprise integration

"E/I": Educational and informational programming that is required for network television broadcast channels in the United States

E_I or ionization energy, the energy required to remove one electron from one atom to another.

Extreme ironing, an extreme sport

Equine influenza, also known as Horse Flu

The exponential integral, a mathematical function

Energy Institute

Electronic ignition

Earth Interactions, a journal

Ei, a town located in Kagoshima, Japan.

ei, a digraph found in some writing systems

The Republic of Ireland, in a number of meanings, including ITU prefixes, from the Irish language name Éire.

The Aer Lingus airlines IATA airline designator

Enterprise Ireland an Irish economic development agency

Electron ionisation an ionisation method in Mass spectrometry

"E.I.", a song by the rapper Nelly

The product of the Young's modulus E and the second moment of inertia I.

Encyclopaedia of Islam, scholarly encyclopaedia covering many aspects of Islam