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

• corresponding members
• corresponds
• corresponsive
• corrida
• corrida de toros
• corridas
• corridor
• corridor-carriage
• corridor-carriages
• corridors
• corridors of power
• corridor-train
• corridor work
• corridor works
• corrie
• corrie-fisted
• corries
• corrigenda
• corrigendum
• corrigent
• corrigents
• corrigibilities
• corrigibility
• corrigible
• corrival