ActiveStyle is an option for Hyperlink and related constructs that specifies styles to add when the constructs are active, typically as a result of the mouse being over them.
AlphaChannel[image] returns the alpha channel of image.
AngleBracket[x, y, ...] displays as \[LeftAngleBracket]x, y, ...\[RightAngleBracket].
BabyMonsterGroupB[] represents the sporadic simple baby monster group B.
BinaryImageQ[image] yields True if image has the form of a binary image, and False otherwise.
BoxData
(Built-in Mathematica Symbol) BoxData[boxes] is a low-level representation of the contents of a typesetting cell.
CellDynamicExpression is an option for cells that specifies an expression to be dynamically updated whenever the cell is visible on-screen.
ColorNegate[image] gives the negative of image, in which all colors have been negated.
ColorSpace is an option for Image and related functions that specifies the color space to which color values refer.
ContinuousTimeModelQ[expr] gives True if expr is a continuous-time StateSpaceModel or TransferFunctionModel object, and False otherwise.