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

• allergy
• allerion
• allerions
• alleviate
• alleviated
• alleviates
• alleviating
• alleviation
• alleviations
• alleviative
• alleviator
• alleviators
• alleviatory
• alley
• alleycat
• alleycats
• alleyed
• alley-oop
• alleys
• alley-taw
• alley-tor
• alleyway
• alleyways
• allez-vous-en
• All-father