Constant is an attribute that indicates zero derivative of a symbol with respect to all parameters.

ContourShading is an option for contour plots that specifies how the regions between contour lines should be shaded.

ControlActive[act, norm] evaluates to act if a control that affects act is actively being used, and to norm otherwise.

ControlType is an option for Manipulate and related functions that specifies what type of controls should be displayed.

Cubics is an option for functions that involve solving algebraic equations, that specifies whether explicit forms for solutions to cubic equations should be given.

Definition[symbol] prints as the definitions given for a symbol.

DirectedEdges is an option for Graph, GraphPlot, and related functions that specifies whether edges should be taken to be directed.

DownValues[f] gives a list of transformation rules corresponding to all downvalues defined for the symbol f.

Dt[f, x] gives the total derivative d f/d x. Dt[f] gives the total differential d f. Dt[f, {x, n}] gives the multiple derivative d^n f/d x^n. Dt[f, x_1, x_2, ...] gives d/d ...

EvaluationMonitor is an option for various numerical computation and plotting functions that gives an expression to evaluate whenever functions derived from the input are ...