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

• snubbing posts
• snubbings
• snubbish
• snubby
• snub cube
• snub cubes
• snub nose
• snub-nosed
• snub noses
• snubs
• snuck
• snudge
• snudged
• snudges
• snudging
• snuff
• snuffbox
• snuffbox bean
• snuffbox beans
• snuffboxes
• snuff-brown
• snuff-colour
• snuff-coloured
• snuff-colours
• snuff-dipper