| Acronym | Meaning |
 | YC | Yoctocoulomb |
| FO | Faroe Islands (ISO 3166 Digram; FIPS 10-4 Territory Code) -Force Operations (military) - Forward Observer - Frame Optional (military Symbology) |
| BPD | Bipolar Personality Disorder |
| TRW | Thompson Ramo Wooldridge Inc. |
| CIWS | Close-In Weapon System |
| KAT | Georgian Language (ISO 639-2 Code) |
| IG | Igbo Language (ISO 639-1 Code) |
| TKL | Tokelau (ISO 3166 Trigram) |
| FR | France (FIPS 10-4 Country Code; ISO 3166 Digram) |
| SOS | Somali Shilling (ISO 4217 Currency Code) |
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