| Acronym | Definition |
|---|
| NSSD➣National Strategies for Sustainable Development |
| NSSD➣Normalized Sum Squared Difference |
| NSSD➣National Security Study Directive |
| NSSD➣National Sun Safety Day (National Council on Skin Cancer Prevention) |
| NSSD➣National Survivors of Suicide Day (American Foundation for Suicide Prevention) |
| NSSD➣National Security Strategy Document |
| NSSD➣Nuclear Safety Services Department |