FCOS
| Acronym | Definition |
|---|---|
| FCOS | Fibre Channel over Sonet |
| FCOS | Formation Continue Obligatoire de Sécurité (France) |
| FCOS | Flight Computer Operating System (US NASA) |
| FCOS | First Church of Satan |
| FCOS | Five Cities Orchid Society (Arroyo Grande, CA) |
| FCOS | Flip Chip on Substrate |
| FCOS | Flight Control Operational Software |
| FCOS | Flight Control Operating System |
| FCOS | Feature Class Of Service |