| Acronym | Meaning |
 | ZAMS | Zero Age Main Sequence |
| GNB | Guinea-Bissau (ISO 3166 Trigram) |
| ATB | Active Time Battle -British Antarctic Territory (ISO 3166 Trigram; Merged With AQ In 1979) |
| IIT | Illinois Institute Of Technology - Indian Institutes Of Technology - Indiana Institute Of Technology |
| AMFR | Age-specific Marital Fertility Rate - Amplitude Modulation Following Response |
| PASGT | Personnel Armor System |
| BDO | Battle Dress Overgarment |
| PR | Public Relations -Puerto Rico (postal Symbol; ISO 3166 Digram) |
| STRATCOM | United States Strategic Command |
| QCA | Qualifications And Curriculum Authority - Quality Council Of Alberta |
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