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

• spray guns
• sprayier
• sprayiest
• spraying
• spray-on
• spray paint
• spray-paint
• spray-painted
• spray-painting
• spray paints
• spray-paints
• sprays
• spray steel
• spray steels
• spread
• spreadable
• spread a plate
• spread betting
• spread eagle
• spread-eagle
• spread-eagled
• spread-eagleism
• spread eagles
• spread-eagles
• spread-eaglewise