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

• pyrometallurgy
• pyrometer
• pyrometers
• pyrometric
• pyrometrical
• pyrometric cones
• pyrometries
• pyrometry
• pyromorphite
• pyromorphites
• pyrope
• pyropes
• pyrophobia
• pyrophobias
• pyrophobic
• pyrophobics
• pyrophone
• pyrophones
• pyrophoric
• pyrophorous
• pyrophorus
• pyrophoruses
• pyrophosphate
• pyrophosphates
• pyrophosphoric