(Main list of acronyms) p – (s) pico P – (s) Peta – Phosphorus P0–9 P2P – (i) Peer-to-peer (networking) P3I or P3I – (i) PrePlanned Product Improvement PA pa – (s) Punjabi language (ISO 639-1 code) pA – (s) picoampere Pa (s) pascal Protactinium PA (a/i) Pamela Anderson (s) Panama (ISO 3166 digram) Paraguay (FIPS 10-4 country code) (i) Partial Agonist (s) Pennsylvania (postal symbol) petampere (i) PolyAmide (Nylon) Prince Albert piercing Public Address (vocal amplification system) Public Affairs PA 6 – (s) Nylon 6 (PolyAmide) (similarly for PA 11, 12, 46, 66, 610) PAA – (i) Position Area for Artillery PAB – (s) Panamanian balboa (ISO 4217 currency code) PABX – (p) Private Automated Branch eXchange (company phone system) PAC (i) Pan Africanist Congress (a) Partial Solar Calibrator Patriot Advanced Capabilities Political action committee (a/i) Primary Auditory Cortex PACER – (a) Public Access to Court Electronic Records (U.S. federal courts) PACOM – (p) (U.S.) Pacific Command PADD (a) Personal Access Display Device (as seen in the Star Trek franchise) Petroleum Administration for Defense Districts, used for data collection in the U.S. petroleum industry PADI – (a) Professional Association of Diving Instructors PAEK – (i) PolyArylEtherKetone PAFC – (i) Plymouth Argyle Football Club PAH – (i) Polycyclic aromatic hydrocarbon PAHO – (i) Pan American Health Organization PAI (i) PolyAmide Imide Pre-Approval Inspection (pharma) PAK – (s) Pakistan (ISO 3166 trigram) Pakistan – (p) Punjab, Afghan states, Kashmir, sIndh, baluchiSTAN PAL (a) Phase Alternating Line (TV standard) (p) Philippine Airlines PAM – (a/i) Precision Attack Missile Pamida – (p) Patrick, Michael, and David, sons of the department store chain's co-founder Jim Witherspoon PAMELA (a) Payload for Antimatter Matter Exploration and Light-nuclei Astrophysics (a) Pedestrian Accessibility and Movement Environment Laboratory pan – (s) Punjabi language (ISO 639-2 code) PAN (s) Panama (ISO 3166 trigram) (a) Partai Amanat Nasional (Indonesian, "National Mandate Party") – Indonesian political party Partido Acción Nacional (Spanish, "National Action Party") – political parties in El Salvador, Mexico, and Nicaragua Partido de Avanzada Nacional (Spanish, "National Advancement Party") – Guatemalan political party Personal area network (i) PolyAcryloNitrile (a) Programa de Asistencia Nutricional (Spanish, "Nutritional Assistance Program") – U.S. federal program for nutritional needs of poor families in Puerto Rico PANS – (a) Pretty Advanced/Awesome Network Services (cf. POTS) Pan-STARRS – (p) Panoramic Survey Telescope And Rapid Response System PAO (i) Panathinaikos Athlitikos Omilos (Greek: Παναθηναϊκός Αθλητικός Όμιλος, "Pan-Athenian Athletic