| Rank | Abbreviation | Meaning |
|---|
| ***** | MFOS | Multi-Functional Operator's Seat
| |
| ***** | MFOS | Montgomery Friends of Open Space
| |
| ***** | MFOS | Mixed Function Oxygenase System
| |
| **** | MFOS | Metal Ferroelectric Oxide Semiconductor
| |
| **** | MFOS | Multi-Functional Optical System
| |
| **** | MFOS | MillenniuM Fibre Optic Systems
| |
| **** | MFOS | Mixed Function Oxidases System
| |
| **** | MFOS | Mogambo Fortress of Solitude
| |
| **** | MFOS | Mongolian Foundation for Open Society
| |
| **** | MFOS | Multi-Function Operation System
| |
| *** | MFOS | Multifunction Operations System
| |
| *** | MFOS | Mixed-Function Oxidases
| |