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

• pin-buttock
• pin-buttocks
• pincase
• pincases
• pince-nez
• pince-nezed
• pincer
• pincered
• pincering
• pincer movement
• pincers
• pinch
• pinchbeck
• pinchbecks
• pinchcock
• pinchcocks
• pinchcommons
• pinched
• pinch effect
• pinch effects
• pincher
• pinchers
• pinches
• pinchfist
• pinchfists