OverBar
(Built-in Mathematica Symbol) OverBar[expr] displays with a bar over expr.
Red
(Built-in Mathematica Symbol) Red represents the color red in graphics or style specifications.
ReturnExpressionPacket[expr] is a MathLink packet that contains the expression expr, the result of an EnterExpressionPacket evaluation.
RunThrough["command", expr] executes an external command, giving the printed form of expr as input and taking the output, reading it as Mathematica input, and returning the ...
ScriptBaselineShifts is an option for Style that specifies the minimum distance in x-heights to shift subscripts and superscripts.
ScrollPosition is an option for Pane that specifies the scroll position of the contents of the pane.
ShowPageBreaks is a notebook option that specifies whether to indicate in the on-screen display of a notebook where page breaks would occur if the notebook were printed.
ShowSpecialCharacters is an option for Style and Cell that specifies whether to replace \[Name], \:nnnn, etc. by explicit special characters.
StartOfLine represents the start of a line in a string for purposes of matching in StringExpression.
SyntaxPacket[integer] is a MathLink packet where integer indicates the position at which a syntax error was detected in the input line.