AtomQ[expr] yields True if expr is an expression which cannot be divided into subexpressions, and yields False otherwise.

Cell[contents] is the low-level representation of a cell inside a Mathematica notebook. Cell[contents, " style"] represents a cell in the specified style.

CMYKColor[cyan, magenta, yellow, black] is a graphics directive which specifies that graphical objects which follow are to be displayed in the color given. CMYKColor[c, m, y, ...

Dashing[{r_1, r_2, ...}] is a two-dimensional graphics directive specifying that lines that follow are to be drawn dashed, with successive segments of lengths r_1, r_2, ... ...

GeometricDistribution[p] represents a geometric distribution with probability parameter p.

HoldAll is an attribute which specifies that all arguments to a function are to be maintained in an unevaluated form.

Information[symbol] prints information about a symbol.

LegendreQ[n, z] gives the Legendre function of the second kind Q_n (z). LegendreQ[n, m, z] gives the associated Legendre function of the second kind Q_n^m(z).

Lighting is an option for Graphics3D and related functions that specifies what simulated lighting to use in coloring 3D surfaces.

ListPointPlot3D[{{x_1, y_1, z_1}, {x_2, y_2, z_2}, ...}] generates a 3D scatter plot of points with coordinates {x_i, y_i, z_i}. ListPointPlot3D[array] generates a 3D scatter ...