| Rank | Abbreviation | Meaning |
|---|
| ***** | IISR | Intelligence, Information, Surveillance and Reconnaissance
| |
| **** | IISR | Intelligence Surveillance and Reconnaissance
| |
| **** | IISR | indirect immunofluorescence serologic reaction
| |
| *** | IISR | Investigator Initiated-Sponsored Research
| |
| *** | IISR | Indexing Storage and Retrieval
| |
| *** | IISR | INTER ISLAND RESORTS LTD.
| |
| *** | IISR | Institute for International Social Research
| |
| *** | IISR | International Institute for Sustainable Future
| |
| ** | IISR | Integrated Information Storage and Retrieval
| |
| ** | IISR | Integrated Intra Squad Radio
| |
| ** | IISR | Interaction of IT Systems and Repositories
| |
| ** | IISR | Institute for the Study of Religions
| |
| * | IISR | Industrial Intelligent Systems Research
| |
| * | IISR | Information and Interactive Services Report
| |
| * | IISR | Institute of Science and Religion
| |
| * | IISR | Iterative Information Set Reduction
| |
| * | IISR | Inbound Interrupt Status Register
| |
| * | IISR | Indian Institute of Spice Research
| |
| * | IISR | Institute of Sugarcane Research
| |
| * | IISR | Institute for Spinal Regeneration
| |
| * | IISR | Institute of Scientific Research
| |
| * | IISR | International Indian School, Riyadh
| |
| * | IISR | Indian Institute of Sugarcane Research
| |
| * | IISR | Institute of Spice Research
| |
| * | IISR | Inside Information Systems Rio
| |