Science

• Degrees Fahrenheit
• 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
• Ef: A Fairy Tale of the Two., a Japanese adult visual novel series by Minori, or its anime adaptations:
• Ef: A Tale of Memories.
• Ef: A Tale of Melodies.
• 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