| Acronym | Definition |
|---|
| PIRS➣Passive Infrared Sensor |
| PIRS➣Papers in Regional Science (journal) |
| PIRS➣Public Information and Reference Service |
| PIRS➣Project Information Retrieval System |
| PIRS➣Poslovni Informator Republike Slovenije (Business Directory of Republic of Slovenia) |
| PIRS➣Police Information Retrieval System (database; Canada) |
| PIRS➣Parliamentary Information and Research Service (Canada) |
| PIRS➣Pacific Immigrant Resources Society (Vancouver, British Columbia, Canada) |
| PIRS➣Propulsion Information Retrieval System |
| PIRS➣Pangaea International Receivable Services (Kalispell, MT) |
| PIRS➣Pollution Incident Reporting System |
| PIRS➣Personnel Information Reporting System |
| PIRS➣Pulsed Infrared System |
| PIRS➣Patent Image Retrieval System |
| PIRS➣FCC Public Information and Reference Services |