Definition: [abbreviation] feminine.
Definition: [abbreviation] (in units of measurement) femto- (10−15).
Example: the detection limits of the enzymatic activity tests are between 10 and 500 fg per test
Definition: [abbreviation] (in textual references) folio.
Definition: [abbreviation] forte.
Definition: [abbreviation] (in racing results) furlong(s).
Example: 2 m 3 f
Definition: [abbreviation] denoting electrons and orbitals possessing three units of angular momentum.
Example: f-orbitals
Definition: [symbol] focal length.
Example: apertures of f/5.6 to f/11
Definition: [symbol] a function of a specified variable.
Example: the value of f(x)
Definition: [symbol] frequency.