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FF, Ff, or ff may refer to:

  • ‹ff›, a Latin alphabet digraph; it is used in English orthography to represent the same sound as single ‹f›, /f/
  • ff, a typographic ligature
  • 255 (number) (hexadecimal: FF16), the natural number following 254 and preceding 256
  • Femtofarad (fF), 1×10−15 farads or units of capacitance
  • Fula language (ISO 639-1 code ff), a language of West Africa
  • Mukti Bahini (Freedom Fighters), the armed organizations who fought against the Pakistan Army during the Bangladesh Liberation War
  • Tower Air (IATA code: FF), a certificated FAR 121 schedule and charter U.S. airline that operated from 1983 until 2000
  • Fianna Fáil, political party in the Republic of Ireland and Northern Ireland
  • False flag, A diversionary or propaganda tactic



  • Fantastic Four, a superhero team appearing in comic books published by Marvel Comics
  • Future Foundation, a fictional superhero team that replaced the Fantastic Four after the death of Johnny Storm, also published by Marvel Comics


  • Logo of Finos Film, a former Greek film production company






  • FontFont, a font library by FontShop International
  • Frequent flyer, often abbreviated as FF# on itineraries or travel documents





  • Fill factor (disambiguation), a term applied in various geometrical models and electronic devices
  • File format, any of numerous ways to encode information on digital media. Occasionally appears abbreviated as ff within particular file format extensions
    • .ff file format, used by game developer Infinity Ward to store data securely
    • .ff file format, used by imaging technologies corporation Agfa-Gevaert to store font outline data
    • .ff file format, used by Arris CAD for Sigmac source code
  • Mozilla Firefox, a web browser developed by Mozilla Foundation
  • Flip-flop (electronics), a digital electronic circuit memory element
  • Form Feed, a control character in the C0 control code set used in ASCII
  • Full-frame digital SLR, a camera fitted with an image sensor equivalent in size to traditional 35mm film