Orbifold Singularities, Lie Algebras of the Third Kind (LATKes), and   Pure Yang-Mills with Matter
  We discover the unique, simple Lie Algebra of the Third Kind, or LATKe, that stems from codimension 6 orbifold singularities and gives rise to a kind of Yang-Mills theory which simultaneously is pure and contains matter. The root space of the LATKe is 1-dimensional and its Dynkin diagram consists of one point. The uniqueness of the LATKe is a vacuum selection mechanism. 
Tamar Friedmann