Look up ef in Wiktionary, the free dictionary.
EF or ef may refer to:
Arts and entertainment
- Ef (band), a post-rock band from Sweden
- Ef: A Fairy Tale of the Two., a Japanese adult visual novel series by Minori, or its anime adaptations
Businesses and organizations
- Eagle Forum, an anti-feminist conservative interest group
- Earth First! movement, in environmentalism
- Eastern Fare, a music institution and production house in Bangalore, India
- EF Education First an international education organization
- The Elias Fund, a non-profit organization
- Far Eastern Air Transport (IATA code EF)
Linguistics
- Ef (Cyrillic) (Ф, ф), a letter in the Cyrillic alphabet
- F (F, f), a letter in the Latin alphabet
Science
Biology and psychology
- Ejection fraction, in cardiovascular physiology
- Elongation factors, proteins that are important in protein synthesis
- Executive functions, a theorized cognitive system in psychology that controls and manages other cognitive processes
Physics
- Electric field, in physics
- Exafarad, an SI unit of electric capacitance
- Fermi energy or Fermi level (EF), both concepts in quantum mechanics
Other sciences
- Ecological footprint, the measure of the demand the population has on the environment
- Enhanced Fujita scale (EF scale), an improved version of the Fujita scale used to rate the intensity of tornadoes
- Ice cap climate, which is abbreviated to EF in the Köppen climate classification
Technology
- Canon EF camera, a manual focus 35mm SLR
- Canon EF lens mount, Canon's auto-focus lens mount
- Entity Framework, an object-relational mapping (ORM) framework for the .NET Framework
Other uses
- Extraordinary Form, a phrase used to describe the Catholic liturgy of the 1962 Roman Missal
- Era Fascista, the Italian fascist calendar
- Extra fine, a condition of a coin
- Eurofurence, a furry convention in Berlin, Germany
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