| Acronym | Meaning |
 | BADD | Battlefield Awareness And Data Dissemination |
| RERC | Rehabilitation Engineering Research Center |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| CMB | Cosmic Microwave Background |
| AAD | Analogue-Analogue-Digital (CD Quality) - Australian Antarctic Division |
| SPCO | Single-Pole Change Over |
| CLIC | Compact LInear Collider |
| FIGJAM | Fuck I'm Good |
| AAV | Amphibious Assault Vehicle |
| MT | Meitnerium |
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