Identity[expr] gives expr (the identity operation).
ImageReflect[image] reverses image by top-bottom mirror reflection. ImageReflect[image, side] reverses image by reflecting it so that the specified side goes to the opposite ...
Legended[expr, lbl] indicates that a legend entry for expr should be created, with label lbl.
Manipulator[x] represents a manipulator with setting x in the range 0 to 1. Manipulator[Dynamic[x]] takes the setting to be the dynamically updated current value of x, with ...
MaxPlotPoints is an option for plotting functions like ArrayPlot and ListPlot3D that specifies the maximum number of points that will explicitly be included in the output.
MemoryInUse[] gives the number of bytes currently being used to store all data in the current Mathematica kernel session. MemoryInUse[$FrontEnd] gives the number of bytes ...
NotebooksMenu is a global option that specifies which recently opened notebooks are listed under the File menu.
SelectionEvaluate[notebook] replaces the current selection in a notebook with the result obtained by evaluating the contents of the selection in the kernel. ...
ShowStringCharacters is an option for Cell that specifies whether to display " when a string is entered.
Skip
(Built-in Mathematica Symbol) Skip[stream, type] skips one object of the specified type in an input stream. Skip[stream, type, n] skips n objects of the specified type.