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UIN is a widely used abbreviation.
Commonly is it used for:
- Universal Internet Number, see ICQ#UIN
- Universal Identification Number
- University Identification Number, used by many universities for students, faculty and alumni
- User Identification Number, used by many computer security systems, see Unique identifier and User (computing)
- Unit Identification Number, used by the military, see Military unit
- Unique Identification Number, similar to Universal Identification Number used for people and inventory, see above, and often replaced by Universally unique identifier (UUID)
Other usages include:
- United Indian Nations, a coalition of twenty-six Native American tribes and nations in Oklahoma, United States
- Unimobile Intelligent Network, a global network for wireless data extending to 500 carriers in 130 countries
- User Intelligent Network, a type of network artificial intelligence, see, for example Personal communications network
- airport code for Quincy Regional Airport in Illinois, United States
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