StyleMenuListing is an option for cells that specifies whether a given cell style is listed in the Format \[FilledRightTriangle] Style submenu.
TabFilling is an option for character selections that specifies how a Tab character is represented on the screen.
TableSpacing is an option for TableForm and MatrixForm which specifies how many spaces should be left between each successive row or column.
TraceDepth is an option for Trace and related functions which specifies the maximum nesting of evaluation chains that are to be included.
TrueQ
(Built-in Mathematica Symbol) TrueQ[expr] yields True if expr is True, and yields False otherwise.
WeightedAdjacencyMatrix[g] gives the adjacency matrix of edge weights of the graph g.
WriteString[channel, expr_1, expr_2, ...] converts the expr_i to strings, and then writes them in sequence to the specified output channel.
$Context is a global variable that gives the current context.
$InputFileName is a global variable whose value is the absolute file name of the input file from which input to Mathematica is currently being sought.
$Input
(Built-in Mathematica Symbol) $Input is a global variable whose value is the name of the stream from which input to Mathematica is currently being sought.