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ISN is an initialism that can stand for:
- Bureau of International Security and Nonproliferation, in the U.S. Department of State
- Intel Software Network
- International Relations and Security Network
- International Socialist Network
- International Society for Neurochemistry
- International Suppliers Network, a vendor tracking system
- Internment Serial Number, an identification number assigned to captives who come under control of the United States Department of Defense during armed conflicts
- Irish Socialist Network
- ITAD Subscriber Numbers, a method of providing inter-domain numeric Session Initiation Protocol addressing
| disambiguation page lists articles associated with the title ISN.
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