ExportString[expr, " format"] generates a string corresponding to expr exported in the specified format. ExportString[rules, {"format", "Rules"}] gives explicit rules for ...
Fourier
(Built-in Mathematica Symbol) Fourier[list] finds the discrete Fourier transform of a list of complex numbers.
GraphHighlightStyle is an option to Graph and related objects that specifies styles to use for highlighted graph elements.
GraphQ
(Built-in Mathematica Symbol) GraphQ[g] yields True if g is a valid Graph object and False otherwise.
GraphStyle is an option to Graph and related objects that specifies styles to use for the different graph elements.
GraphUnion[g_1, g_2] gives the graph union of the graphs g_1 and g_2.GraphUnion[g_1, g_2, ...] gives the graph union of g_1, g_2, ....
Inpaint
(Built-in Mathematica Symbol) Inpaint[image, region] retouches parts of image that correspond to nonzero elements in region.
LineGraph[g] gives the line graph of the graph g.
Modulus
(Built-in Mathematica Symbol) Modulus -> n is an option that can be given in certain algebraic functions to specify that integers should be treated modulo n.
NMaxValue[f, x] gives the maximum value of f with respect to x.NMaxValue[f, {x, y, ...}] gives the maximum value of f with respect to x, y, .... NMaxValue[{f, cons}, {x, y, ...