ScreenStyleEnvironment is an option for notebooks that specifies the style environment to be used in displaying a notebook on the screen.
ScriptMinSize is an option for Style that specifies the minimum font size to use in rendering subscripts, etc.
SetAccuracy[expr, a] yields a version of expr in which all numbers have been set to have accuracy a.
SpanSymmetric is an option for selections that specifies whether vertically expandable characters are symmetric about the axis of the selection.
StyleMenuListing is an option for cells that specifies whether a given cell style is listed in the Format \[FilledRightTriangle] Style submenu.
TargetFunctions is an option for functions such as ComplexExpand that specifies what functions to attempt to generate in the output.
Threshold[data] thresholds data by replacing values close to zero by zero.Threshold[data, tspec] thresholds data using threshold specification tspec.Threshold[image, ...] ...
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.
WhitespaceCharacter represents a single whitespace character in StringExpression.