Since Version 3.0 (released in 1996), DefaultFont has been superseded by StyleForm and TextStyle.
Display
(Obsolete Mathematica Symbol) As of Version 6.0, Display is superseded by capabilities in Export.
As of Version 6.0, DisplayString is superseded by capabilities in ExportString.
Since Version 5.0 (released in 2003), DSolveConstants has been superseded by GeneratedParameters.
Dump
(Obsolete Mathematica Symbol) Since Version 3.0 (released in 1996), Dump has been superseded by DumpSave.
As of Version 8.0, ExpectedValue has been superseded by Expectation and NExpectation.
As of Version 6.0, FactorComplete has been superseded by FactorInteger[n, All] and FactorInteger[n, Automatic].
Since Version 3.0 (released in 1996), FontForm has been superseded by StyleForm and TextStyle.
Since Version 2.0 (released in 1991), FromASCII has been superseded by FromCharacterCode.
Since Version 4.0 (released in 1999), FullOptions has been superseded by AbsoluteOptions.