| Acronym | Meaning |
 | TLS | Timor-Leste (ISO 3166 Trigram) -Times Literary Supplement |
| HSC | High School Certificate (as Used In New South Wales) |
| SEP | Somebody Else's Problem - Spherical Error Probable - System Enhancement Package - System Engineering Plan |
| SDO | Scattered Disc Object |
| AU | African Union (was OAU Before 2000) - American University -Astronomical Unit - Australia (ISO 3166 Digram) - Austria (FIPS 10-4 Country Code) |
| PPQT | Pre-Production Qualification Test |
| ITEMS | Interactive Tactical Environment Management System |
| WWF | World Wildlife Fund - World Wrestling Federation |
| SCO | Scotland |
| MDW | Chicago Midway International Airport In Chicago |
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