EF

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, a Latin letter

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 (E_F), 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 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, see Calendar era#Political
• Extra fine, a condition of a coin