ChampernowneNumber[b] gives the base-b Champernowne number C_b.ChampernowneNumber[] gives the base-10 Champernowne number.
DatePattern[{"e_1", "e_2", ...}] represents the characters of a date with elements of type "e_i" in StringExpression.DatePattern[{"e_1", "e_2 ", ...}, sep] allows separators ...
DefaultButton[] represents an OK button that closes a dialog, and is the default when DynamicBox[ToBoxes[If[$OperatingSystem === "MacOSX", "Return", "Enter"], StandardForm], ...
DialogInput[expr] interactively puts up expr as a dialog notebook, waits until a DialogReturn[e] is evaluated from within it, and then returns the result e. DialogInput[{x = ...
DisplayForm[expr] prints with low-level boxes inside expr shown in explicit two-dimensional or other form.
DynamicSetting[e] represents an object which displays as e, but is interpreted as the dynamically updated current value of Setting[e] if supplied as Mathematica ...
EmptyGraphQ[g] yields True if g is an empty graph and False otherwise.
Extract
(Built-in Mathematica Symbol) Extract[expr, list] extracts the part of expr at the position specified by list. Extract[expr, {list_1, list_2, ...}] extracts a list of parts of expr. Extract[expr, list, h] ...
GatherBy[list, f] gathers into sublists each set of elements in list that gives the same value when f is applied.GatherBy[list, {f_1, f_2, ...}] gathers list into nested ...
GraphDifference[g_1, g_2] gives the graph difference of the graphs g_1 and g_2.