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

• lyam-hound
• lyam-hounds
• lyams
• lyart
• lyase
• lyases
• Lycaena
• lycaenid
• Lycaenidae
• lycaenids
• lycanthrope
• lycanthropes
• lycanthropic
• lycanthropies
• lycanthropist
• lycanthropists
• lycanthropy
• lyceum
• lyceums
• lychee
• lychees
• lychgate
• lychgates
• Lychnapsia
• Lychnic