Blank
(Built-in Mathematica Symbol) _or Blank[] is a pattern object that can stand for any Mathematica expression. _h or Blank[h] can stand for any expression with head h.
BoxBaselineShift is an option for AdjustmentBox that specifies how much the baseline of the box should be shifted relative to those of neighboring characters.
BoxFrame is an option for FrameBox objects that specifies whether to draw a frame around the contents of the box.
ButtonFunction is an option for the low-level function ButtonBox that specifies the function to execute when the button is active and is clicked.
CellLabel is an option for Cell which gives the label to use for a particular cell.
ColorFunctionScaling is an option for graphics functions that specifies whether arguments supplied to a color function should be scaled to lie between 0 and 1.
ColumnLines is an option for the low-level function GridBox which specifies whether lines should be drawn between adjacent columns.
Compress[expr] gives a compressed representation of expr as a string.
ContinuousAction is an option for Manipulate, Slider, and related functions that specifies whether action should be taken continuously while controls are being moved.
ControllerMethod is an option for Manipulate, Graphics3D, Plot3D, and related functions that specifies the default way that controls on an external controller device should ...