Notebooks (Built-in Mathematica Symbol)

Notebooks[] gives a list of notebooks currently open in the front end.

NRoots (Built-in Mathematica Symbol)

NRoots[lhs == rhs, var] yields a disjunction of equations which represent numerical approximations to the roots of a polynomial equation.

Opening (Built-in Mathematica Symbol)

Opening[image, ker] gives the morphological opening of image with respect to the structuring element ker.Opening[image, r] gives the opening with respect to a range r square.

SetDirectory (Built-in Mathematica Symbol)

SetDirectory["dir"] sets the current working directory to dir. SetDirectory[] sets the current working directory to your "home" directory.

ShowGroupOpener (Built-in Mathematica Symbol)

ShowGroupOpener is an option for cells that specifies whether an opener icon is displayed next to the leading cell in a cell group to indicate whether the cell group is open ...

TimeZone (Built-in Mathematica Symbol)

TimeZone is an option for DateString, AbsoluteTime, and related functions that specifies the time zone to use for dates and times.

Underoverscript (Built-in Mathematica Symbol)

Underoverscript[x, y, z] is an object that formats as x_y^z.

Unset (Built-in Mathematica Symbol)

lhs =. removes any rules defined for lhs.

$NewSymbol (Built-in Mathematica Symbol)

$NewSymbol is a global variable which, if set, is applied to the name and context of each new symbol that Mathematica creates.

$Post (Built-in Mathematica Symbol)

$Post is a global variable whose value, if set, is applied to every output expression.