FF is an abbreviation for:

• Fast forward, a way of maneuvering a cassette tape or other linear media
• Form Feed, an ASCII control character
• Folios following - an archaic way of saying "and the following pages" (used in indexes)
• The US Navy Hull classification symbol for frigate.
• FF layout - front engine, front drive
• German = Freiwillige Feuerwehr (FireFighter)
• Fan fiction
• Fantastic Four
• Force field
• Fortissimo
• Fill factor
• Flip flop in digital logic
• Family Feud, a game show
• Fear Factor
• Finos Films , short form for the main filming company of Greece.
• Foo Fighters
• Final Fantasy, a popular video game title (FFa in fighting game circles)
• Fatal Fury, another video game (FFu in DOS FAT filenames)
• Final Fight, another video game (FFi outside fighting game circles)
• FireFox, the WWW browser (Incorrect but common usage. The correct abbreviation is Fx.)
• FF, a value in hexadecimal representing the largest value that can fit in a single byte: the number 255.
• Fieldbus Foundation , an organization dedicated to a fieldbus standard or their technology Foundation Fieldbus
• Flirty Fishing, an indoctrination technique utilized historically the new religious movement, the Children of God / The Family