| Acronym | Definition |
|---|
| NPSI | Non Partitioned Secondary Index |
| NPSI | Network Protocol Service Interface |
| NPSI | Ncp Packet Switching Interface |
| NPSI | NCP (Network Control Program) Packet Switching Interface |
| NPSI | National Playground Safety Institute |
| NPSI | North Pittsburgh Systems (stock symbol) |
| NPSI | National Protective Services Institute (San Antonio, TX) |
| NPSI | National Prep School Invitational |
| NPSI | Neuropathic Pain Symptom Inventory |
| NPSI | American National Straight Intermediate Pipe Thread |
| NPSI | Network Control Program Packet Switch Interface |