EF

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EF or ef may refer to:

Arts and entertainment[edit]

Businesses and organizations[edit]

Linguistics[edit]

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

Science[edit]

Biology and psychology[edit]

Physics[edit]

Other sciences[edit]

Technology[edit]

Other uses[edit]