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

• midway
• midways
• mid-week
• Midwest
• Midwestern
• Midwesterner
• mid-wicket
• mid-wickets
• jargonised
• jargonises
• jargonising
• jargonist
• jargonistic
• jargonists
• jargonization
• jargonizations
• jargonize
• jargonized
• jargonizes
• jargonizing
• jargons
• jargoon
• jargoons
• jark
• jarkman