| Acronym | Meaning |
 | SI | Slovenia (ISO 3166 And FIPS 10-4 Country Code Digram) -Socialist International - Sports Illustrated - Syst?me International (French |
| ATN | Dronning Maud Land (ISO 3166 Trigram; Merged With AQ In 1983) |
| GPL | General Public License |
| LTU | Lithuania (ISO 3166 Trigram) |
| IC | Ice Crystals (METAR Code) - Iceland (FIPS 10-4 Country Code) -Integrated Circuit |
| COO | Chief Operating Officer |
| FMS | Federal Magistrates Service (an Australian Federal Court |
| SLC | Scan Line Corrector |
| LSST | Large Synoptic Survey Telescope |
| B?C | Blue ?yster Cult |
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