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

• write to
• write up
• write-up
• writhe
• writhed
• writhen
• writhes
• writhing
• writhingly
• writhings
• writhled
• writing
• writing-book
• writing-books
• writing case
• writing cases
• writing desk
• writing desks
• writing-ink
• writing-inks
• writing-master
• writing-masters
• writing on the wall
• writing pad
• writing pads