GraphDisjointUnion[g_1, g_2] gives the graph disjoint union of the graphs g_1 and g_2.GraphDisjointUnion[g_1, g_2, ...] gives the disjoint union of g_1, g_2, ....
HigmanSimsGroupHS[] represents the sporadic simple Higman\[Dash]Sims group HS.
InputAutoReplacements is an option for cells and notebooks which specifies strings of characters that should be replaced immediately on input.
KroneckerSymbol[n, m] gives the Kronecker symbol (n/m).
MessageDialog[expr] puts up a standard message dialog that displays expr together with an OK button.MessageDialog[expr, {lbl_1 :> act_1, lbl_2 :> act_2, ...}] includes ...
MouseAnnotation[] gives any mouse annotation associated with the expression at the current mouse position.
Names
(Built-in Mathematica Symbol) Names["string"] gives a list of the names of symbols which match the string. Names[patt] gives a list of names matching the arbitrary string pattern patt.
p : v is a pattern object that represents an expression of the form p, which, if omitted, should be replaced by v.
PlotRegion is an option for graphics functions that specifies what region of the final display area a plot should fill.
Protected is an attribute which prevents any values associated with a symbol from being modified.