EF

EF or ef can refer to multiple things:

cience

*Degrees Fahrenheit [ [http://www.uoguelph.ca/ehs/policies/06-20.pdf Work In Extreme Heat] ]
*Fermi energy (E_F)
*Ejection fraction, in cardiovascular physiology
*Electric field, in physics
*Elongation factors, proteins that are important in protein synthesis

Other

* Ef (Cyrillic) (Ф, ф), a letter in the Cyrillic alphabet
* Ef (band), a post-rock band from Sweden
* "", a Japanese adult visual novel series by Minori, or its anime adaptations:
** ""
** ""
* A common misspelling of the Latin letter F (eff)
*The IATA code for Far Eastern Air Transport
*Earth First! movement, in environmentalism
*EF Education language schools, in education
*EF lens mount, Canon's auto-focus lens mount
*Exafarad, an SI unit of electric capacitance
*The Elias Fund, a non-profit organization
*Enhanced Fujita Scale, an improved version of the Fujita Scale used to rate tornadoes
*Eurofurence, a European furry convention
*Ecological footprint, the measure of the demand the population has on the environment
*Polar climate

References