Subscript[x, y] is an object that formats as x_y. Subscript[x, y_1, y_2, ...] formats as x Subscript[y, 1], Subscript[y, 2], ....
SuperscriptBox[x, y] is the low-level box representation for x^y in notebook expressions.
ToCharacterCode["string"] gives a list of the integer codes corresponding to the characters in a string. ToCharacterCode["string", " encoding"] gives integer codes according ...
TopologicalSort[g] gives a list of vertices of g in topologically sorted order for a directed acyclic graph g.
TotalVariationFilter[image] iteratively reduces noise while preserving edges in image.TotalVariationFilter[image, param] assumes a regularization parameter value param.
UnderscriptBox[x, y] is the low-level box representation for UnderscriptBox[x, y] in notebook expressions.
ViewVector is an option for Graphics3D and related functions which specifies the position and direction of a simulated camera used to view three-dimensional objects.
WindowSize is a notebook option that specifies the size of window that should be used to display a notebook on the screen.
$MessageGroups is the list of rules that gives named message groups used in functions like On and Quiet.
Basic Plotting Options for Graphics Redrawing and Combining Plots