$DynamicEvaluation is a symbol whose value is True if it is evaluated as part of the evaluation of a Dynamic.
$ImagingDevices gives a list of available imaging devices.
$ReleaseNumber is an integer which gives the current Mathematica kernel release number, and increases in successive releases.
"Values for Symbols" discussed how you can use transformation rules of the form x->value to replace symbols by values. The notion of transformation rules in Mathematica is, ...
int MLPutFunction (MLINK link, const char *s, int n) puts a function with head given by a symbol with name s and with n arguments to the MathLink connection specified by link.
FourierSeries, FourierTrigSeries, and FourierCoefficient are part of the Mathematica kernel. FourierSinCoefficient and FourierCosCoefficient are now in the built-in ...
RuntimeOptions is an option for Compile that specifies runtime settings for the compiled function it creates.
TimeConstraint is an option for various algorithmic functions which specifies how long to spend trying a particular transformation or part of an algorithm.
RowReduce[m] gives the row-reduced form of the matrix m.
MOL
(Mathematica Import/Export Format) MIME type: chemical/x-mdl-molfile MDL molecule model files. Used in cheminformatics applications and on the web for storing and exchanging 3D molecule models. Plain text ...