Ff.
Origin
Abbreviation of Latin folio ("on the (next) page"), ablative of folium ("leaf, page").
{{abbreviation-old|en}}
ff.- and the following (pages, paragraphs etc.)
Usage notes
The abbreviation ff. is used in citation to refer to a section for which no final number can usefully be given. When used, ff. has no space between it and the preceding number and is followed by a full stop. If there is only a single section following, f. may be used instead.
More properly, it is still used, as originally, to refer to the next page or pages in a citation. As such, Hornblower 258f. would refer to pages 258–259 while 258ff. would refer to an undetermined number of pages following page 258.