sort by Rank | Alpha
| Possible Meanings | Rank |
|---|
| International UFO Reporter | *** |
| Islamitische Universiteit Rotterdam | *** |
| Institute for UFO Research | *** |
| International Union of Railways | *** |
| International Union Rights | *** |
| International Union of Radioecologists | ** |
| immediate upstream region | ** |
| intra-uterine resections | ** |
| Inventory Update Reporting | ** |
| Islamic University of Rotterdam | ** |
| intra-uterine growth retardation | ** |
| isotropic uniform random tissue | ** |
| Informational Unsolicited Responses | ** |
| Inhalation Unit Risk | ** |
| Interface User Record | ** |
| Irish University Review | ** |
| Isotropic Uniform Random | ** |
| Irreducible Unitary Representation | * |
| Is the Unemployment Rate | * |
| Intended Use Report | * |
| International UFO Review | * |
| Indiana Utility Regulatory | * |