| Acronym | Meaning |
| CAA | Canadian Automobile Association - (NORAD) Center For Aerospace Analysis - (U.S.) Center For Army Analysis - (U.S.) Clean Air Act - (U.S. Army) Concepts Analysis Agency - Civil Aviation Authority - Colonial Athletic Association |
| ZN | Zinc |
| EMS | Emergency Medical Services |
| OIOC | Oriental & India Office Collections (in The British Library) |
| SNCB | Soci?t? Nationale Des Chemins De Fer Belgique (French For Belgian Railways National Society) |
| ZV | Zettavolt |
| TWN | Republic Of China (Taiwan) (ISO 3166 Trigram) |
| WPB | War Production Board During World War II |
| KAL | Kalaallisut Language (ISO 639-2 Code) |
| ULF | Ultra Low Frequency |