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

• compression ratios
• compressions
• compressive
• compressor
• compressors
• compressure
• compressures
• comprimario
• comprimarios
• comprint
• comprinted
• colourisation
• colourise
• colourised
• colourises
• colourising
• colourist
• colouristic
• colourists
• colourization
• colourizations
• colourize
• colourized
• colourizes
• colourizing