| Acronym | Meaning |
 | PU | Guinea-Bissau (FIPS 10-4 Country Code) -Polyurethane -United States Miscellaneous Pacific Islands (ISO 3166 Digram; Obsolete 1986) |
| CTIS | Central Tire-Inflation System |
| LTZ | Luxembourgish Language (ISO 639-2 Code) |
| SSTO | Single-Stage To Orbit |
| MEF | U.S. Marine Expeditionary Force - Minimum Essential Facility - Mission Essential Force |
| MANPADS | MAN-Portable Air Defence System |
| C3 OR C? | Colorectal Cancer Condition - Command |
| LRS | Long Range Surveillance |
| NREL | U.S. National Renewable Energy Laboratory |
| HG | Mercury (Latin Hydrargyrum) |
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