EF or ef may refer to:

Arts and entertainment

Ef (band) Ef (stylized as EF) is a post-rock band from Gothenburg, Sweden. Using little vocals, they feature a wide variety of instruments. Their debut album ''Give me beauty... Or give me death!'' was released in May 2006 on their own label And The Sound ...

, 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 Eagle Forum is a conservative advocacy group in the United States founded by Phyllis Schlafly in 1972. Focused on social issues, it is socially conservative and describes itself as pro-family. Critics have described it as anti-feminist, an ...

, an anti-feminist conservative interest group *

Earth First! Earth First! is a radical environmentalism, radical Environmental movement, environmental advocacy group that originated in the Southwestern United States. It was founded in 1980 by Dave Foreman, Mike Roselle, Howie Wolke, Bart Koehler, and Ron K ...

, movement, in environmentalism *

Eastern Fare The Eastern Fare Music Foundation is a music school, as well as a production and publishing house in Guwahati, Assam, India. The institute provides training for instrumental music in Western Classical music, Carnatic music and contemporary styl ...

, a music institution and production house in Bangalore, India *

EF Education First EF Education First (abbreviated as EF) is an international education company that specialises in language training, educational travels, academic degree programmes, and cultural exchanges. The company was founded in 1965 by Bertil Hult in the S ...

, an international education organization * The Elias Fund, a non-profit organization *

Far Eastern Air Transport FAT Taiwan Inc., () doing business as Far Eastern Air Transport (FAT), was an airline with its head office in Songshan District, Taipei, Taiwan (Republic of China). Established in 1957, it operated domestic services from Taipei and Kaohsiung ...

(IATA code EF)

Linguistics

Ef (Cyrillic) Ef or Fe (Ф ф; italics: ) is a Cyrillic letter, commonly representing the voiceless labiodental fricative , like the pronunciation of in ''fill'', ''flee'' or ''fall''. The Cyrillic letter Ef is romanized as . History The Cyrillic letter ...

(Ф, ф), a letter in the Cyrillic alphabet * F (F, f), a letter in the Latin alphabet

Science

Biology and psychology

Ejection fraction An ejection fraction (EF) is the volumetric fraction (or portion of the total) of fluid (usually blood) ejected from a chamber (usually the heart) with each contraction (or heartbeat). It can refer to the cardiac atrium, cardiac ventricle, gall ...

, in cardiovascular physiology *

Elongation factor Elongation factors are a set of proteins that function at the ribosome, during protein synthesis, to facilitate translational elongation from the formation of the first to the last peptide bond of a growing polypeptide. Most common elongation ...

s, proteins that are important in protein synthesis *

Executive functions In cognitive science and neuropsychology, executive functions (collectively referred to as executive function and cognitive control) are a set of cognitive processes that support goal-directed behavior, by regulating thoughts and actions thro ...

, a theorized cognitive system in psychology that controls and manages other cognitive processes

Physics

Electric field An electric field (sometimes called E-field) is a field (physics), physical field that surrounds electrically charged particles such as electrons. In classical electromagnetism, the electric field of a single charge (or group of charges) descri ...

, in physics *

Exafarad The farad (symbol: F) is the unit of electrical capacitance, the ability of a body to store an electrical charge, in the International System of Units (SI), equivalent to 1 coulomb per volt (C/V). It is named after the English physicist Micha ...

, an SI unit of electric capacitance *

Fermi energy The Fermi energy is a concept in quantum mechanics usually referring to the energy difference between the highest and lowest occupied single-particle states in a quantum system of non-interacting fermions at absolute zero temperature. In a Fermi ga ...

Fermi level The Fermi level of a solid-state body is the thermodynamic work required to add one electron to the body. It is a thermodynamic quantity usually denoted by ''μ'' or ''E''F for brevity. The Fermi level does not include the work required to re ...

(''E''_F), both concepts in quantum mechanics

Other sciences

Ecological footprint The ecological footprint measures human demand on natural capital, i.e. the quantity of nature it takes to support people and their economies. It tracks human demand on nature through an ecological accounting system. The accounts contrast the biolo ...

, the measure of the demand the population has on the environment *

Enhanced Fujita scale The Enhanced Fujita scale (abbreviated EF-Scale) is a scale that rates tornado intensity based on the severity of the damage a tornado causes. It is used in the United States and France, among other countries. The EF scale is also unofficially ...

(EF scale), an improved version of the Fujita scale used to rate the intensity of tornadoes *

Ice cap climate An ice cap climate is a polar climate where no mean monthly temperature exceeds . The climate generally covers areas at high altitudes and Polar regions of Earth, polar regions (60–90° north and south latitude), such as Antarctica and some of ...

, which is abbreviated to EF in the Köppen climate classification

Technology

Canon EF camera The Canon EF is a manual focus 135 film, 35mm single-lens reflex camera produced by Canon Inc., Canon between 1973 and 1978. It was compatible with Canon's Canon FD, FD-mount lenses. The EF was built as an electro-mechanical version of Canon's t ...

, a manual focus 35mm SLR *

Canon EF lens mount The EF lens mount is the standard lens mount on the Canon EOS family of SLR film and digital cameras. EF stands for "Electro-Focus": automatic focusing on EF lenses is handled by a dedicated electric motor built into the lens. Mechanically, it i ...

, Canon's autofocus lens mount *

Entity Framework Entity Framework (EF) is an open source object–relational mapping (ORM) framework for ADO.NET. It was originally shipped as an integral part of .NET Framework, however starting with Entity Framework version 6.0 it has been delivered separatel ...

, an object-relational mapping (ORM) framework for the .NET Framework

Other uses

Extraordinary Form In the Catholic Church, preconciliar Latin liturgical rites ("preconciliar": before the Second Vatican Council, which began in 1962) coexist with postconciliar rites. In the years following the Second Vatican Council, Pope Paul VI initiated sig ...

, a phrase used to describe the Catholic liturgy of the 1962 Roman Missal *

Era Fascista The ''Era Fascista'' (English: 'Fascist Era') was a calendar era (year numbering) used in the Italian fascism, Fascist-ruled Kingdom of Italy. The March on Rome, or more precisely the accession of Benito Mussolini, Mussolini as Prime Minister ...

, the Italian fascist calendar * Extra fine, a condition of a coin * Eurofurence, a furry convention in Berlin, Germany {{disambig