| Rank | Abbreviation | Meaning |
|---|
| ***** | NDOS | Norton Disk Operating System
| |
| **** | NDOS | New Dimension Online Services
| |
| **** | NDOS | National Defense Operations Section
| |
| **** | NDOS | Neurotic Disorder Outcome Scale
| |
| **** | NDOS | Nuffield Department of Orthopaedic Surgery
| |
| *** | NDOS | Network and Desktop Outsourcing Services
| |
| *** | NDOS | Nonlinear Dynamics in Optical Systems
| |
| *** | NDOS | Network Denial of Service
| |
| *** | NDOS | Network Disc Operating System
| |
| *** | NDOS | Next Day Onsite Service
| |
| *** | NDOS | National Day Of Slayer
| |
| ** | NDOS | Nuclear Data Online Services
| |
| ** | NDOS | National Day of Silence
| |
| * | NDOS | Nonlinear Dynamics and Optics
| |
| * | NDOS | Network and Desktop Outsourcing
| |
| * | NDOS | National Day of Service
| |
| * | NDOS | New Disk Operating System
| |
| * | NDOS | Novell Disk Operating System
| |
| * | NDOS | not directly observable states
| |