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

• residentiaries
• residentiary
• residentiaryship
• residents
• residentship
• residentships
• resider
• residers
• resides
• residing
• residua
• residual
• residual activity
• residual current device
• residual current devices
• residually
• residuals
• residual value
• residuary
• residuary legatee
• residue
• residues
• residuous
• residuum
• re-sign