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

• insufferableness
• insufferably
• insufficience
• insufficiencies
• insufficiency
• insufficient
• insufficiently
• insufflate
• insufflated
• insufflates
• insufflating
• insufflation
• insufflations
• insufflator
• insufflators
• insula
• insulae
• insular
• insularism
• insularisms
• insularities
• insularity
• insularly
• insulas
• insulate