| Acronym | Meaning |
 | SDS | Students For A Democratic Society |
| CTSS | Compatible Time-Sharing System |
| RSRE | UK Royal Signals And Radar Establishment (1976?1991) |
| CIV | C?te D'Ivoire (ISO 3166 Trigram) |
| DY | Dysprosium |
| SGS | South Georgia And The South Sandwich Islands (ISO 3166 Trigram) -Svalbard Ground Station (Landsat) - Soci?t? G?n?rale De Surveillance |
| LSST | Large Synoptic Survey Telescope |
| IGY | International Geophysical Year |
| IMF | International Monetary Fund |
| ABIN | Ag?ncia Brasileira De Intelig?ncia (Brazilian Intelligence Agency) |
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