| Acronym | Meaning |
 | IMSA | Illinois Mathematics And Science Academy - International Mind Sports Association - International Motor Sports Association |
| CGIG | Cross-Government Implementation Group |
| PIM | Parameterized Ionospheric Model - Path Of Intended Motion - Pediatric Index Of Mortality - Personal Information Manager/Management - Presence And Interworking Mobility - Processor-In-Memory - Program Integration Manager - Protocol Independent Multicast |
| SME | Northern Sami Language (ISO 639-2 Code) |
| PLAID | Precision Location And Identification |
| LUG | Linux User Group |
| IPCC | Intergovernmental Panel On Climate Change |
| DSTL | British Defence Science And Technology Laboratory |
| LEU | Low-Enriched Uranium |
| NRAO | National Radio Astronomy Observatory |
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