DirectoryQ (Built-in Mathematica Symbol)

DirectoryQ["name"] gives True if the directory with the specified name exists, and gives False otherwise.

DivideBy (Built-in Mathematica Symbol)

x /= c divides x by c and returns the new value of x.

DynamicEvaluationTimeout (Built-in Mathematica Symbol)

DynamicEvaluationTimeout is an option for displayed objects, cells, and notebooks that specifies the timeout in seconds for any Dynamic computations they contain.

ExpandFileName (Built-in Mathematica Symbol)

ExpandFileName["name"] textually expands name to have the form of an absolute file name for your operating system.

FieldMasked (Built-in Mathematica Symbol)

FieldMasked is an option to InputField that determines whether to mask user input.

FileExistsQ (Built-in Mathematica Symbol)

FileExistsQ["name"] gives True if the file with the specified name exists, and gives False otherwise.

GapPenalty (Built-in Mathematica Symbol)

GapPenalty is an option for SequenceAlignment and related functions that gives the additional cost associated with each gap corresponding to a run of insertions or deletions.

GeoDestination (Built-in Mathematica Symbol)

GeoDestination[pos, {d, \[Alpha]}] gives the geodetic position reached by going distance d in azimuthal direction \[Alpha] from pos.

GeometricMeanFilter (Built-in Mathematica Symbol)

GeometricMeanFilter[image, r] filters image by replacing every value by the geometric mean of the values in its range r neighborhood. GeometricMeanFilter[data, r] applies ...

HamiltonianGraphQ (Built-in Mathematica Symbol)

HamiltonianGraphQ[g] yields True if the graph g is Hamiltonian, and False otherwise.