FormatType is an option for output streams, graphics, and functions such as Text that specifies the default format type to use when outputting expressions.
For
(Built-in Mathematica Symbol) For[start, test, incr, body] executes start, then repeatedly evaluates body and incr until test fails to give True.
FreeQ
(Built-in Mathematica Symbol) FreeQ[expr, form] yields True if no subexpression in expr matches form, and yields False otherwise. FreeQ[expr, form, levelspec] tests only those parts of expr on levels ...
FrobeniusNumber[{a_1, ..., a_n}] gives the Frobenius number of a_1, ..., a_n.
FromContinuedFraction[list] reconstructs a number from the list of its continued fraction terms.
FrontEndExecute[expr] sends expr to be executed by the Mathematica front end.
FullDefinition[symbol] prints as the definitions given for symbol, and all symbols on which these depend.
GaussianIntegers is an option for FactorInteger, PrimeQ, Factor, and related functions that specifies whether factorization should be done over Gaussian integers.
GenomeLookup["seq"] returns the positions of exact matches for the DNA sequence seq on the reference human genome.GenomeLookup["seq", n] returns at most n matches.
GeoGridPosition[{x, y, z}, projection] represents a point {x, y, z} in a planimetric cartographic grid using the specified projection.