StreamStyle is an option to StreamPlot, StreamDensityPlot, and related functions that determines the style to use for drawing streamlines.
StringFormat["string"] attempts to determine what ImportString format could be used to import the string " string".
SynchronousInitialization is an option for Manipulate, DynamicModule, and related functions that specifies whether or not to evaluate the expression given as the setting for ...
SystemOpen["target"] opens the specified file, URL, or other target with the associated program on your computer system.
SystemsModelLabels is an option to StateSpaceModel and TransferFunctionModel that specifies labels of the variables.
Uncompress["string"] recovers an expression from a compressed string representation generated by Compress.Uncompress["string", h] wraps the head h around the expression ...
Undefined is a symbol that represents a quantity with no defined value.
VertexAdd[g, v] makes a graph by adding the vertex v to the graph g.VertexAdd[g, {v_1, v_2, ...}] adds a collection of vertices to g.
VertexDelete[g, v] makes a graph by deleting the vertex \[Nu] and all edges connected to v from the graph g.VertexDelete[g, {v_1, v_2, ...}] deletes a collection of vertices ...
WordSeparators is an option for Read, Find, and related functions that specifies the list of strings to be taken as delimiters for words.