| Acronym | Meaning |
 | OS | Osmium |
| KX | Cayman Airways (IATA Airline Designator) |
| JSP | Joint Services Publication |
| GCSE | General Certificate Of Secondary Education (UK) |
| COPUS | U.K. Committee On The Public Understanding Of Science |
| CAT | Community Acceptance Testing - Computer-Assisted (or Axial) Tomography |
| NT | Iraq-Saudi Arabia Neutral Zone (ISO 3166 Digram; Obsolete 1993) - Northern Territory (Australia) (postal Symbol) - Northwest Territories (Canada) (postal Symbol) - National Trust (UK) |
| YUPPIE | Young Urban Professional + Suffix |
| PUS | United States Miscellaneous Pacific Islands (ISO 3166 Trigram; Obsolete 1986) |
| COS | Corsican Language (ISO 639-2 Code) - Cosine |
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