FO
| Abbreviation | Meaning | Tamil Meaning | Category |
|---|---|---|---|
| FO | Fail Operational | - | Organizations |
| FO | Fiber Optics | - | Organizations |
| FO | Objective | - | Organizations |
| FO | F*ck Off | - | ISO Country Codes |
| FO | Faroe Islands (ISO 3166 Digram; FIPS 10-4 Territory Code) -Force Operations (military) - Forward Observer - Frame Optional (military Symbology) | - | Astronomy |
| FO | Faroese Language (ISO 639-1 Code) | - | Astronomy |
| FO | Orbital Frequency | - | Business and Finance |
| FO | Field Office | - | Business and Finance |
| FO | fail open | - | Human Genome |