| Acronym | Meaning |
 | RRN | Recurrence Rate Number |
| FISH | Fluorescence In-Situ Hybridisation |
| PD | Palladium |
| CSS | Cascading Style Sheets - Catalina Sky Survey - Central Security Service - Combat Service Support - Confederate States Ship - Content-scrambling System - Cross-site Scripting |
| FG | Fog (METAR Code) - French Guiana (FIPS 10-4 Territory Code) |
| TSR | Many |
| IFR | Instrument Flight Rules |
| DGD&D | UK Directorate General Of Development And Doctrine |
| TCWMS | Tele-Center Workforce Management System |
| CCH | Computer-Controlled Hostile |
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