One of the books I’ve been reading recently is Medieval Europe: A Short History by Hollister. He uses, quite often, the abbreviation “f.” or “ff.”, for example:
The Golden Age of the Abbasids: 750 ff.
I wasn’t sure what the abbreviation meant, so I dutifully looked it up. It apparently means, simply, “and the following (pages, verses, years, etc.)”.
(The abbreviation can also stand for “fortissimo”, meaning “in a very loud manner”, but I’m fairly confident that that isn’t the meaning Hollister had in mind!)