SuperscriptBox (Built-in Mathematica Symbol)

SuperscriptBox[x, y] is the low-level box representation for x^y in notebook expressions.

UnderscriptBox (Built-in Mathematica Symbol)

UnderscriptBox[x, y] is the low-level box representation for UnderscriptBox[x, y] in notebook expressions.

VerticalTilde (Built-in Mathematica Symbol)

VerticalTilde[x, y, ...] displays as x\[VerticalTilde]y\[VerticalTilde]....

WindowSize (Built-in Mathematica Symbol)

WindowSize is a notebook option that specifies the size of window that should be used to display a notebook on the screen.

$Canceled (Built-in Mathematica Symbol)

$Canceled is a symbol returned when notebook input is canceled, for example from a dialog box.

$CurrentLink (Built-in Mathematica Symbol)

$CurrentLink is the LinkObject representing the MathLink connection for an external program currently being installed or being called.

$LicenseID (Built-in Mathematica Symbol)

$LicenseID is a string that gives the license ID under which Mathematica is being run.

$MaxNumber (Built-in Mathematica Symbol)

$MaxNumber gives the maximum arbitrary-precision number that can be represented on a particular computer system.

$MaxPrecision (Built-in Mathematica Symbol)

$MaxPrecision gives the maximum number of digits of precision to be allowed in arbitrary-precision numbers.

$RootDirectory (Built-in Mathematica Symbol)

$RootDirectory gives the root directory of your file system.