| ASA | Astronomical Society of the Atlantic [engl.] |
| aj | Astronomical Journal |
| IRAS | Infrared Astronomical Satellite |
| IAU | International Astronomical Union Paris, [F], http://www.iau.org |
| ANS | Astronomical Netherlands Satellite [engl.] |
| AIPS | Astronomical Image Processing System [engl.] |
| HEAO | High Energy Astronomical Observatory [Satellit] |
| ESO | European Organisation for Astronomical Research in the Southern Hemisphere Europäische Organisation für astronomische Forschung in der südlichen Hemisphäre |
| Pac. Sci. | Pacific Science Zeitschrift |
| APAC | Asia and Pacific [engl.] Wirtschaftsraum Asien und Länder des Pazifiks |
| POR | Pacific Ocean Region |
| PNB | Pacific Northwest Bell |
| PBD | Pacific Bell Directory |
| PDT | Pacific Daylight Time |
| TPG | Texas Pacific Group Inc. San Francisco, [CA], http://www.texaspacificgroup.com |
| TPR | Trans Pacific Radio |
| EPR | East Pacific Rise |
| CPR | Canadian Pacific Railway |
| UP | Union Pacific [railroad] |
| AP | Asian Pacific [engl.] Geografischer Wirtschaftsraum |
| UIAP | UNIX International Asia / Pacific |
| APRU | Association of Pacific Rim Universities [engl.] Verbund von 36 pazifischen Universitäten |
| FJ | Air Pacific [IATA-Airline-Code/ Fiji] |
| LW | Pacific Wings [IATA-Airline-Code/ USA] |
| APSC | Asian Pacific Space Center [engl.] Weltraumkonsortium mit Sitz in Sydney |
| APNG | Asian Pacific Network Group [engl.] Firmenzusammenschluss |
| A&P | The Great Atlantic & Pacific Tea Company [engl.] Montvale, [NJ], http://www.aptea.com |
| APFC | Asia - Pacific Forestry Commission [engl.] |
| ACP | African, Caribean and Pacific Countries [engl.] Wirtschaftsraum |
| APEC | Asiatic Pacific Economic Cooperation [engl.] 21 Staaten umfassende wirtschaftliche Zusammenarbeit, Sitz Singapur |
| 5J | Cebu Pacific [IATA-Airline-Code/ Philippinen] |
| 7C | Columbia Pacific Airlines [IATA-Airline-Code/ USA] |
| 9J | Pacific Island Aviation [IATA-Airline-Code/ USA] |
| SI | Sierra Pacific Airlines [IATA-Airline-Code / USA] |
| BL | Pacific Airlines [IATA-Airline-Code/ Vietnam] |
| APN | Asia Pacific Network [for Global Change] [engl.] Klimaraum |
| APNIC | Asia Pacific Network Information Center [engl.] verwaltet Internetadressen [Domains] |
| APIPA | Asia Pacific Intellectual Property Association [engl.] |
| 1Z | Sabre Pacific [IATA-Airline-Code/ Australien] |
| CX | Cathay Pacific [IATA-Airline-Code/ China/HongKong] |
| QO | Origin Pacific Airways [IATA-Airline-Code / Neuseeland] |
| AP-CCIRN | Asia/Pacific Coordinating Committee for Intercontinental Research Networks |
| 8P | Pacific Coastal Airlines [IATA-Airline-Code/ Kanada] |
| NPL | Nauru Pacific Line/Reederei, Nauru |
| ESO | Emerald Society vgl. http://members.aol.com/eirepages/esgpages.htm |
| ESO | European Society |
| IES | International EPR Society |
| DECUS | DEC Users Society |
| RS | Royal Society |
| ESN | European Society of Nematologists vgl. http://esn.boku.ac.at |