| Acronym | Meaning |
 | GF | French Guiana (ISO 3166 Digram) - Gigafarad |
| YW | Yottawatt |
| WLN | Walloon Language (ISO 639-2 Code) |
| MOD | Ministry Of Defence (United Kingdom) And Various Other Countries |
| HIPPARCOS | HIgh Precision Parallax COllecting Satellite |
| RT | PCR -Real Time Polymerase Chain Reaction Or Reverse Transcriptase Polymerase Chain Reaction. Clarified With Real Time RT-PCR Or Reverse Transcriptase RT-PCR Where Appropriate. |
| ADDNS | Advanced Deployable Day/Night Simulation |
| AAR | After-Action Review - Association Of American Railroads |
| GPR | Ground-Penetrating Radar |
| ADD | Analog Digital Digital (CD Quality) - Attention-Deficit Disorder - Administration On Developmental Disabilities |
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