<Li> Polish Sign Language ("Polski Język Migowy") </Li> <Li> Puerto Jiménez Airport (IATA: PJM, ICAO: MRPJ) in Puerto Jiménez, Costa Rica </Li> <Li> PJM, a hardy hybrid rhododendron, where the letters stand for Peter John Mezitt, patriarch of Weston Nurseries, Hopkinton, Massachusetts, where the cultivar originated </Li> <Li> PJM Interconnection, a regional transmission organization (RTO) in the eastern United States that operates the world's largest competitive wholesale electricity market </Li>

What does pjm stand for in pjm rhododendron