ff or ff.

1. Fecerunt (Latin), (they) did it or made it
2. Folios (printing)
3. Following pages, lines, etc
4. Fortissimo (music)

FF

1. Form feed (computing)
2. French franc or francs

• multi-tracks
• multituberculate
• multituberculated
• multitude
• multitudes
• multitudinary
• multitudinous
• multitudinously
• multitudinousness
• multiuser
• multivalence
• multivalences
• multivalencies
• multivalency
• multivalent
• multivariate
• multivarious
• multiverse
• multiverses
• multiversity
• multivibrator
• multivibrators
• multivious
• multi-vision
• multivitamin