| Acronym | Meaning |
 | NSS | (U.S.) Naval Simulation System |
| ESA | Electro-Spark Alloying - Endangered Species Act - European Space Agency |
| O | Oberst - Observer - Obstacle - Octal - Officer - Official - Oh - Operational - Operator - Oprah (magazine) - Outstanding -Oxygen |
| NETL | (US) National Energy Technology Laboratory |
| VC | Saint Vincent And The Grenadines (FIPS 10-4 Country Code; ISO 3166 Digram) -Victoria Cross |
| BDU | Battle-Dress Uniform |
| CDMSII | Cryogenic Dark Matter Search II |
| DEFCON | Defence Readiness Condition |
| NLP | Natural Language Processing - Neuro-Linguistic Programming (pseudoscience) |
| KS | Kansas (postal Symbol) - Republic Of Korea (FIPS 10-4 Country Code) |
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