Evaluator is an option for objects such as Button, Dynamic, and Cell that gives the name of the kernel to use to evaluate their contents.
ExpandFileName["name"] textually expands name to have the form of an absolute file name for your operating system.
ExponentialDistribution[\[Lambda]] represents an exponential distribution with scale inversely proportional to parameter \[Lambda].
FileDate["file"] gives the date and time at which a file was last modified. FileDate["file", " type"] gives information on the specified type of date associated with a file.
FileExistsQ["name"] gives True if the file with the specified name exists, and gives False otherwise.
FrameBox[box] is a low-level box construct which represents box with a frame drawn around it.
FrameMargins is an option for objects that can be displayed with frames which specifies the absolute margins in printer's points to leave inside the frame.
FunctionSpace is an option for FindSequenceFunction and related functions that specifies the space of functions to consider for representations.
GaborWavelet[] represents a Gabor wavelet of frequency 6.GaborWavelet[w] represents a Gabor wavelet of frequency w.
GeoDestination[pos, {d, \[Alpha]}] gives the geodetic position reached by going distance d in azimuthal direction \[Alpha] from pos.