A Gamma Pattern (after ErichGamma) is
one of the KindsOfPatterns.
It is a pattern that
describes some constellation of structure or behavior
that recurs in softwares.

EditHint: ''How exactly is this different than DesignPatterns?''  Seconded.  Is the term "GammaPattern" widely used in the patterns community?  If not, we should merge this with DesignPatterns.

See DesignPatterns and the GangOfFour.