| Acronym | Meaning |
 | DSN | Deep Space Network |
| AX | land Islands (ISO 3166 Digram) |
| PL | Ice Pellets (new Style METAR Code) -petalitre -Phase Line (Co-ordination Line) -Poland (ISO 3166 And FIPS 10-4 Country Code Digram) |
| UW | University Of Washington |
| UXO | Unexploded Ordnance |
| WIMP | Weakly Interacting Massive Particle - Windows |
| 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 |
| QA | Qatar (FIPS 10-4 Country Code; ISO 3166 Digram) |
| HVU | High Value Unit (military) |
| UNU | United Nations University |
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