sučelje aplikativnog programiranja Academic Programs International American Petroleum Institute Anonima Petroli Italiana Anton Pannekoek Instituut, astronimski institut Sveučilišta u Amsterdamu Associated Producers Incorporated, podržnica 20th Century Foxa Australian Pharmaceutical Industries Australian Property Institute Academic Performance Index, mjera školskog dosega u Kaliforniji Sveučilište Auburn, prije zvano Alabama Polytechnic Institute