What does PPN stand for?

Numismatic and Antiquarian Society, Philadelphia, PA - Library symbol - Library of Congress - Obsolete (LCLS)

Papenoo - Society Islands - Seismograph station code, US Geological Survey (SEIS)

Parameterized Post-Newtonian - Gravity

Parametrized Post-Newtonian - Physics

Partial Parenteral Nutrition - Medicine (DMAA)

Partido Patriotico Nobo - New Patriotic Party - Aruba - Political party (EY)

Partido Progreso Nacional - National Progress Party - Costa Rica - Political party (PPW)

Parti Progressiste Nigerien - Nigerian Progressive Party - Political party

Patient Progress Note (SAUS)

Patrol Plane Navigator (DNAB)

Peak-to-Peak Noise - Instrumentation

Pedunculopontine Nucleus (DMAA)

Peer-To-Peer Network - Computer science (AGLO)

Peripendicular Nucleus (SAUS)

Peripheral Parenteral Nutrition - Medicine (DAVI)

Peroxypropionyl Nitrate (SAUS)

Peroxypropionyl Nitride (SAUS)

Peroxyproprionyl Nitrate - Organic chemistry

Polyphosphonate - Organic chemistry

Popayan - Colombia - Airport symbol (OAG)

Portland Public Library, Portland, ME - OCLC symbol (OCLC)

Precipitation (WGA)

Predictive Proportional Navigation

Preferred Provider Network

Principal-Protected Note

Private Packet Network

Programmer Project Number (SAUS)

Project, Programmer Number

Proportion (ROG)

Proposition - Telegraphy (PCTE)

Protoplanetary Nebulae - Astrophysics

Public Packet Network - Computer science (ODBW)

Pyramidopallidonigral (DB)

Proportion (AD)

proportional (SAUS)