■ abbreviation
1》 Grammar feminine.
2》 femto- (10 -15 ).
3》 (in textual references) folio.
4》 Music forte.
5》 (in racing results) furlong(s).
6》 Chemistry denoting electrons and orbitals possessing three units of angular momentum. [ f from fundamental , orig. applied to lines in atomic spectra.]
■ symbol
1》 focal length.
2》 Mathematics a function of a specified variable.
3》 Electronics frequency.