| Acronym | Definition |
|---|
| FSOS➣Free-Space Optical System |
| FSOS➣Friendly Sons of the Shillelagh (New Jersey) |
| FSOS➣Fifty Shades of Sexy |
| FSOS➣Food Service Operating Supplies |
| FSOS➣Family Support Orders Service (Canada) |
| FSOS➣Future Sounds of Swing |
| FSOS➣For the Sake of the Salmon (est. 1995) |
| FSOS➣False Sense of Security (Exies song title) |
| FSOS➣Functional Significance of Stereopsis (medicine) |
| FSOS➣Free Standing Operating System |
| FSOS➣Flight Support Operations and Services |