| 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 |