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. They had several tours with sho ...

, 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 interest group in the United States founded by Phyllis Schlafly in 1972 and is the parent organization that also includes the Eagle Forum Education and Legal Defense Fund and the Eagle Forum PAC. The Eagle Forum ha ...

, an anti-feminist conservative interest group *

Earth First! Earth First! is a radical 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 Kezar. Today there are Earth First! groups aroun ...

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 style ...

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

EF Education First EF Education First (abbreviated as EF) is an international education company that specializes in language training, educational travel, academic degree programs, and cultural exchange. The company was founded in 1965 by Bertil Hult in the Sw ...

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 . In some languages it is known as ...

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

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, ventricle, gall bladder ...

, 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 are necessary for the cognitive control of behavior: selecting and succ ...

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

Physics

Electric field An electric field (sometimes E-field) is the physical field that surrounds electrically charged particles and exerts force on all other charged particles in the field, either attracting or repelling them. It also refers to the physical field ...

, 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). It is named after the English physicist Michael Faraday (1791–1867). In SI base unit ...

, 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 remov ...

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

Other sciences

Ecological footprint The ecological footprint is a method promoted by the Global Footprint Network to measure human demand on natural capital, i.e. the quantity of nature it takes to support people or an economy. It tracks this demand through an ecological account ...

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

Enhanced Fujita scale The Enhanced Fujita scale (abbreviated as EF-Scale) rates tornado intensity based on the severity of the damage they cause. It is used in some countries, including the United States, Canada, China, and Mongolia. The Enhanced Fujita scale repla ...

(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 covers areas in or near the high latitudes (65° latitude) to polar regions (70–90° north and south latitude), such as Antarctica, some of the northe ...

, which is abbreviated to EF in the Köppen climate classification

Technology

Canon EF camera The Canon EF is a manual focus 35mm single-lens reflex camera produced by Canon between 1973 and 1978. It was compatible with Canon's FD-mount lenses. The EF was built as an electro-mechanical version of Canon's top-of-the line wholly mechani ...

, 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 ...

, Canon's auto-focus lens mount * Entity Framework, an object-relational mapping (ORM) framework for the .NET Framework

Other uses

Extraordinary Form In the Catholic Church, the use of preconciliar rites after the Second Vatican Council has resulted in certain Latin liturgical rites coexisting with older ("preconciliar": "before the Second Vatican Council") versions of those same rites. In the ...

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

Era Fascista The ''Era Fascista'' ("Fascist Era") was a calendar era (year numbering) used in Fascist Italy. The March on Rome, or more precisely the accession of Mussolini as prime minister on 29 October 1922, is day 1 of '' Anno I'' of the ''Era Fascis ...

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