Dotted
(Built-in Mathematica Symbol) Dotted is a graphics directive specifying that lines that follow should be drawn dotted.
FrameBox[box] is a low-level box construct which represents box with a frame drawn around it.
Left
(Built-in Mathematica Symbol) Left is a symbol that represents the left-hand side for purposes of alignment and positioning.
NotebookDelete[notebook] deletes the current selection in the notebook corresponding to the specified notebook object. NotebookDelete[] deletes the current selection in the ...
Opener
(Built-in Mathematica Symbol) Opener[x] represents an opener with setting x, displayed as OpenerBox[True] when x is True and OpenerBox[False] when x is False. Opener[Dynamic[x]] takes the setting to be ...
Overscript[x, y] is an object that formats as OverscriptBox[x, y].
PassEventsUp is an option to EventHandler that specifies whether events handled by a particular event handler should be passed up to event handlers in outer expressions.
ResumePacket[] is a MathLink packet used for synchronization with the Mathematica kernel.
Right
(Built-in Mathematica Symbol) Right is a symbol that represents the right-hand side for purposes of alignment and positioning.
x_y^z is the low-level box representation for x_y^z in notebook expressions.