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

• Oxford commas
• Oxford English
• Oxford groups
• Oxfordian
• Oxford movement
• Oxfords
• Oxford shoe
• oxgang
• oxgangs
• oxgate
• oxgates
• oxhead
• oxheads
• oxi-
• oxidant
• oxidants
• oxidase
• oxidases
• oxidate
• oxidated
• oxidates
• oxidating
• oxidation
• oxidational
• oxidation-reduction