V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

FF
       Form(ular) Feed


The Free On-line Dictionary of Computing (30 December 2018):

form feed
FF

    (FF, Control-L, ASCII 12) The character used to
   start a new page on a printer.  This is done by "feeding" a
   new page (or "form") through the printer.

   (1996-06-24)