CellGroupData[{cell_1, cell_2, ...}] is a low-level construct that represents an open group of cells in a notebook. CellGroupData[{cell_1, cell_2, ...}, 1] represents a cell ...
CompiledFunction[args...] represents compiled code for evaluating a compiled function.
ComplexityFunction is an option for Simplify and other functions which gives a function to rank the complexity of different forms of an expression.
patt /; test is a pattern which matches only if the evaluation of test yields True. lhs :> rhs /; test represents a rule which applies only if the evaluation of test yields ...
Control
(Built-in Mathematica Symbol) Control[{u, dom}] represents an interactive control for the variable u in the domain dom, with the type of control chosen to be appropriate for the domain ...
DefaultButton[] represents an OK button that closes a dialog, and is the default when DynamicBox[ToBoxes[If[$OperatingSystem === "MacOSX", "Return", "Enter"], StandardForm], ...
DeleteCases[expr, pattern] removes all elements of expr that match pattern. DeleteCases[expr, pattern, levelspec] removes all parts of expr on levels specified by levelspec ...
Dilation[image, ker] gives the morphological dilation of image with respect to the structuring element ker.Dilation[image, r] gives the dilation with respect to a range r ...
Dithering is an option for ColorQuantize that specifies whether or not to apply dithering while quantizing the pixel values.
FindPermutation[expr] gives a permutation that produces expr by permuting Sort[expr].FindPermutation[expr 1, expr 2] gives a permutation that converts expr_1 to expr_2 for ...