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

• barrancos
• barrat
• barrator
• barrators
• barratries
• barratrous
• barratrously
• barratry
• barrats
• Barr body
• barre
• barred
• barred code
• barred codes
• barrefull
• barrel
• barrelage
• barrelages
• barrel-bulk
• barrel-bulks
• barrel-chested
• barrelful
• barrelfuls
• barrelhouse
• barrelhouses