BoundaryStyle is an option for plotting functions that specifies the style in which boundaries of regions should be drawn.
CharacterEncoding is an option for input and output functions which specifies what raw character encoding should be used.
Constants is an option for Dt which gives a list of objects to be taken as constants.
ContentSize is an option for Manipulate and other functions that specifies the size of the content area to use.
DefaultAxesStyle is a low-level option for graphics functions that specifies the default style to use in displaying axes and axes-like constructs.
DefaultFrameStyle is a low-level option for graphics and related constructs that specifies the default style to use in displaying their frames.
EdgeDelete[g, e] makes a graph by deleting the edge e from the graph g.EdgeDelete[g, {e_1, e_2, ...}] deletes a collection of edges from g.EdgeDelete[g, patt] deletes all ...
FileNameJoin[{"name_1", "name_2", ...}] joins the name_i together into a file name suitable for your current operating system.
FindLibrary[lib] finds a dynamic library that can be loaded by LibraryFunctionLoad.
Flatten
(Built-in Mathematica Symbol) Flatten[list] flattens out nested lists. Flatten[list, n] flattens to level n. Flatten[list, n, h] flattens subexpressions with head h. Flatten[list, {{s_11, s_12, ...}, ...