| Full Form | Category | Term |
|---|---|---|
| Interface Service Node | Computer and Networking | ISN |
| Interface Serving Node (SG11) | Computer and Networking | ISN |
| Intelligent Sensor Network | Networking | ISN |
| Information Services and Networking | Networking | ISN |
| Internal Sequence Number | Accounts and Finance | ISN |
| Inter-set Network | Space Science | ISN |
| Williston (nd) | Airport Code | ISN |
| Initial Sequence Number | Maths | ISN |
| Internal Serial Number | Military and Defence | ISN |
| Bureau of International Security and Nonproliferation | Military and Defence | ISN |
| Internment Serial Number | Military and Defence | ISN |
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