of Presence Post Office Protocol Progesterone Only Pill por – (s) Portuguese language (ISO 639-2 code) POR (s) Portugal (FIFA and IOC trigram, but not ISO 3166) (i) Proposed Operational Requirement POS (a/i) Point Of Sale terminal (retail industry transaction computers) (i) Piece Of S**t POSH – (a) Port Outbound Starboard Home (alleged) POTC o PotC – (a) Pirates of the Caribbean POSSLQ – Person of the Opposite Sex Sharing Living Quarters POT – (a/i) Plane Of Tranquility POTS (a) Plain Old Telephone Service (cf. PANS) Postural orthostatic tachycardia syndrome POV – (i) Point of view POW – (i) Prisoner of war PP pp pages, especially in references, e.g. "A. U. Thor, Title, Journal X, Vol. 1, no. 2 (2010) pp. 13-42." PP (s) Papua New Guinea (FIPS 10-4 country code) (i) Passage Point per procurationem (Latin, "by proxy") PPA (i) Parahippocampal Place Area PolyPhthalAmide PPASC – (i) (U.S.) Plans and Program Analysis Support Center PPASSCCATAG - (a) "Proud Parents Against Singles, Seniors, Childless Couples And Teens And Gays", a fictional group formed by Marge Simpson PPCLI – (i) Princess Patricia's Canadian Light Infantry (regiment) PPG (i) Pittsburgh Plate Glass (the original name of the company now known as PPG Industries) The Powerpuff Girls PPL (i) Pakistan Petroleum Limited Pay per lead (marketing) Pennsylvania Power & Light, former name of the U.S. utility company now known as PPL Pfadfinder und Pfadfinderinnen Liechtensteins (German, "Scouts and Guides of Liechtenstein") Phonographic Performance Limited (UK performing rights organisation) PPLI – (i) Precise Participant Location & Identification ppm – (i) Parts Per Million PPM – (i) Parts Per Million PPM – (i) Project Planning and Management PPO – (i) PolyPhenylene Oxide PPP (i) Point-to-Point Protocol Purchasing Power Parity PPQ – (i) Pulses Per Quarter (used in music programming, sequencers) PPQN – (i) Pulses Per Quarter Note (ditto) PPQT – (i) Pre-Production Qualification Test PPS (i) post postscriptum Precise/Precision Positioning Service (GPS) PolyPhenylene Sulfide PPV – (a) Pay-per-view PQ PQ (s) Province of Québec (obsolete postal code, replaced by QC) (i) Parti Québécois PR Pr – (i) Pastor or Priest Pr – (s) Praseodymium PR (i) Public Relations (s) Puerto Rico (postal symbol; ISO 3166 digram) Prb – (i) Presbyter PRBO – (i) Point Reyes Bird Observatory PRC – (i) People's Republic of China PRD – (i) CERDEC Product Realization Directorate PRFG – (s) Partial Fog (METAR Code) PRI – (s) Puerto Rico (ISO 3166