$DefaultFont (Obsolete Mathematica Symbol)

As of Version 3, $DefaultFont has been superseded by settings in notebook stylesheets, and as of Version 6 by options such as BaseStyle.

$InstallationDate (Obsolete Mathematica Symbol)

As of Version 6.0, $InstallationDate is no longer supported in typical computer system configurations.

$MachineDomain (Obsolete Mathematica Symbol)

As of Version 6.0, $MachineDomain has been superseded by $MachineDomains.

$ProductInformation (Obsolete Mathematica Symbol)

As of Version 6.0, $ProductInformation has been superseded by SystemInformation.

$RandomState (Obsolete Mathematica Symbol)

As of Version 6.0, $RandomState has been superseded by the scoping construct BlockRandom.

$TemporaryPrefix (Obsolete Mathematica Symbol)

As of Mathematica 7.0, $TemporaryPrefix has been superseded by $TemporaryDirectory.

$TopDirectory (Obsolete Mathematica Symbol)

Since Version 5.0 (released in 2003), $TopDirectory has been superseded by $InstallationDirectory and $BaseDirectory.

$UserAddOnsDirectory (Obsolete Mathematica Symbol)

Since Version 5 (released in 2003), $UserAddOnsDirectory has been superseded by $UserBaseDirectory.

$$Media (Obsolete Mathematica Symbol)

Since Version 2.0 (released in 1991), $$Media has been superseded by Streams.

Linear Algebra in Mathematica: ... (Obsolete Mathematica Tutorial)

ARPACK is a collection of Fortran77 subroutines designed to solve large-scale eigenvalue problems. http://www.caam.rice.edu/software/ARPACK The ATLAS (Automatically Tuned ...