Assumptions is an option for functions such as Simplify, Refine, and Integrate that specifies default assumptions to be made about symbolic quantities.
BarOrigin is an option to BarChart and related functions that specifies the origin placement for bars.
ButtonBox[boxes] is a low-level box construct that represents a button in a notebook expression.
CompleteGraphQ[g] yields True if the graph g is a complete graph, and False otherwise.CompleteGraphQ[g, vlist] yields True if the subgraph induced by vlist is a complete ...
Complexes represents the domain of complex numbers, as in x \[Element] Complexes.
CopyToClipboard[expr] replaces the contents of the clipboard with expr.
DataDistribution[ddist, ...] represents a probability distribution of type ddist, estimated from a set of data.
Depth
(Built-in Mathematica Symbol) Depth[expr] gives the maximum number of indices needed to specify any part of expr, plus 1.
DynamicModule[{x, y, ...}, expr] represents an object which maintains the same local instance of the symbols x, y, ... in the course of all evaluations of Dynamic objects in ...
E
(Built-in Mathematica Symbol) E is the exponential constant E (base of natural logarithms), with numerical value \[TildeEqual] 2.71828.