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

• whip socket
• whip sockets
• whips of
• whipstaff
• whipstaffs
• whipstall
• whipstalled
• whipstalling
• whipstalls
• whipster
• whipsters
• whipstitch
• whipstitched
• whipstitches
• whipstitching
• whipstock
• whipstocks
• whipt
• whiptail
• whiptailed
• whiptail hake
• whip the cat
• whip-top
• whipworm
• whipworms