CellLabelPositioning is an option for cells that specifies where the label for a cell is positioned.
Plain
(Built-in Mathematica Symbol) Plain represents a font that is not bold, italic, or underlined.
SyntaxPacket[integer] is a MathLink packet where integer indicates the position at which a syntax error was detected in the input line.
UnderoverscriptBoxOptions -> {opt_1 -> val_1, opt_2 -> val_2, ...} is an option for selections that specifies settings for UnderoverscriptBox objects.
$InitialDirectory gives the initial directory when the current Mathematica session was started.
Message
(Built-in Mathematica Symbol) Message[symbol::tag] prints the message symbol::tag unless it has been switched off. Message[symbol::tag, e_1, e_2, ...] prints a message, inserting the values of the e_i as ...
OutputForm[expr] prints as a two-dimensional representation of expr using only keyboard characters.
Mathematica saves information about every plot you produce, so that you can later redraw it. When you redraw plots, you can change some of the options you use. Functions for ...
Mathematica provides fully integrated spline graphics primitives, such as Bézier curves, B-spline curves, and B-spline surfaces. The spline primitives support a full range of ...
RamanujanTauZ[t] gives the Ramanujan tau Z-function Z(t).