| Acronym | Meaning |
 | CTSS | Compatible Time-Sharing System |
| ID | Idaho (postal Symbol) -Identity -Indonesia (FIPS 10-4 Country Code; ISO 3166 Digram) -Infantry Division - Intelligent Design |
| PYG | Paraguayan Guarani (ISO 4217 Currency Code) |
| SETAC | Society For Environmental Toxicology And Chemistry |
| APR | Annual Percentage Rate |
| UNCTAD | United Nations Conference On Trade And Development |
| SSKP | Single-Shot Kill Probability |
| DPPDB | Digital Point Positioning Database |
| GALCIT | Guggenheim Aeronautical Laboratory |
| COROT | COnvection |
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