| Acronym | Meaning |
| NRU | Nauru (ISO 3166 Trigram) |
| USCINCSPACE | United States Commander In Chief |
| RSS | Really Simple Syndication |
| IMU | International Mathematical Union |
| A2C2 OR A?C? | Army Airspace Command And Control |
| MAO | Mol?t? Astronomijos Observatorija (Moletai Astronomical Observatory) - MonoAmine Oxidase |
| TTZ | Tetrazolium |
| NMD | U.S. National Missile Defense |
| AGU | American Geophysical Union |
| ASBL | Association Sans But Lucratif (French Non-profit Organisation) |