title: UIN
text: # UIN
  
  UIN may refer to:
  
  ## Common
  
  * User Identification Number, used by many computer security systems and ICQ, see ICQ#UIN, Unique identifier and User (computing)
  * Universal Identification Number
     * used for people, see National identification number and Unique Identification Authority of India, see also Permanent account number (PAN)
     * used for inventory, see also UID
  * University Identification Number, used by many universities for students, faculty and alumni
  * Unit Identification Number, used by the military, see Military unit
  * Unit Identification Number, used by the Department of Education, see Integrated Postsecondary Education Data System
  * Unique Identification Number, similar to Universal Identification Number used for people and inventory, see above, and often replaced by Universally unique identifier (UUID)
  
  ## Other uses
  
  * 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
  