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

• microbiota
• microblog
• microblogging
• microblogs
• microbrew
• microbreweries
• microbrewery
• microbrews
• microbrowser
• microbrowsers
• microburst
• microbursts
• microbus
• microbuses
• microbusses
• microcapsule
• microcapsules
• microcar
• microcard
• microcards
• microcars
• microcassette
• microcassettes
• microcephal
• microcephalic