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

• big iron
• big money
• bigmouth
• bigmouthed
• bigmouths
• big name
• big names
• bigness
• bignesses
• big noise
• big noises
• bignonia
• Bignoniaceae
• bignoniaceous
• bignonias
• big-note
• big-noted
• big-notes
• big-noting
• bigot
• bigoted
• bigotries
• bigotry
• bigots
• Big Pharma