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

• Shetland wool
• sheuch
• sheuched
• sheuching
• sheuchs
• sheugh
• sheughed
• sheughing
• sheughs
• sheva
• shevas
• Shevat
• Shevuoth
• shew
• shewbread
• shewbreads
• shewed
• shewel
• shewels
• shewing
• shewn
• shews
• shf
• SHF
• shh