What does PPN stand for ?
PPN may refer to : Guillermo León Valencia Airport Pre-Pottery Neolithic Nigerien Progressive Party - African Democratic Rally , from the French acronym , " Parti Progressiste Nigérien " Pandit Pran Nath Parameterized post-Newtonian formalism Pingat Pangkuan Negara , a Malaysian honour Pedunculopontine nucleus Principal protected notes , an investment product Protoplanetary nebula Parameterized post-Newtonian formalism , a classification system for different theories of gravity