• Unique Identification Number later renamed as Aadhaar number, an initiative of Unique Identification Authority of India
  Unique Identification Authority of India
  The Unique Identification Authority of India , is an agency of the Government of India responsible for implementing the AADHAAR scheme, a unique identification project. It was established in February 2009, and will own and operate the Unique Identification Number database...
  
   of the Indian government to create a unique ID for every Indian resident.
• UID = VAT identification number
  Value added tax identification number
  A value added tax identification number or VAT identification number is an identifier used in many countries, including the countries of the European Union, for value added tax purposes....
  
   (in German language) (VAT: Value added tax)
• Ulster Institute for the Deaf
• Umeå Institute of Design
  Umeå Institute of Design
  The Umeå Institute of Design, UID, is an institute within Umeå University. UID opened in 1989 and is designed and equipped solely for the teaching of industrial design, transportation design, and interaction design...
  
  
• Universal Instructional Design
  Universal Instructional Design
  Universal Instructional Design or Universal Design for Instruction is a teaching process that involves considering the potential needs of all learners when designing and delivering instruction through identifying and eliminating unnecessary barriers to teaching and learning while maintaining...
  
  , an educational method that tries to deliver teaching to meet the needs of wide variety of learners.
• Unintelligent Design, a satirical reaction to the Intelligent Design movement
• Unique identifier
  Unique identifier
  With reference to a given set of objects, a unique identifier is any identifier which is guaranteed to be unique among all identifiers used for those objects and for a specific purpose...
  
  
• PubMed 'Unique Identifier' parameter designating specific scientific publication abstracts; see: PMID
• 'Unique Item Identifier', a specific value in the Item Unique Identification system
  IUID
  Item Unique IDentification is an asset identification system instituted by the United States Department of Defense to uniquely identify a discrete tangible item or asset and distinguish it from other like and/or unlike tangible items...
  
   used by the United States Department of Defense for the identification of accountable equipment according to DoD Instruction 5000.64

Computing

• A Unique identifier
  Unique identifier
  With reference to a given set of objects, a unique identifier is any identifier which is guaranteed to be unique among all identifiers used for those objects and for a specific purpose...
  
  
  • Unique identifier for a specific User of a computer system
    User (computing)
    A user is an agent, either a human agent or software agent, who uses a computer or network service. A user often has a user account and is identified by a username , screen name , nickname , or handle, which is derived from the identical Citizen's Band radio term.Users are...
    
    
  • Unique ID of a message in a folder on an IMAP server
  • See also Globally unique identifier
    Globally Unique Identifier
    A globally unique identifier is a unique reference number used as an identifier in computer software. The term GUID also is used for Microsoft's implementation of the Universally unique identifier standard....
    
     (GUID)
  • See also Universally unique identifier
    Universally Unique Identifier
    A universally unique identifier is an identifier standard used in software construction, standardized by the Open Software Foundation as part of the Distributed Computing Environment ....
    
     (UUID)
• User identifier (Unix)
  User identifier (Unix)
  Unix-like operating systems identify users within the kernel by an unsigned integer value called a user identifier, often abbreviated to UID or User ID...
  
  , a code identifying each user on a Unix and Unix-like systems
• User interface design
  User interface design
  User interface design or user interface engineering is the design of computers, appliances, machines, mobile communication devices, software applications, and websites with the focus on the user's experience and interaction...
  
  , device design with the focus on the user's experience and interaction
• 'Unit IDentification light', a light found on all HP/Compaq DL servers that allows users to distinguish which server they are working on in a server rack
  19-inch rack
  A 19-inch rack is a standardized frame or enclosure for mounting multiple equipment modules. Each module has a front panel that is wide, including edges or ears that protrude on each side which allow the module to be fastened to the rack frame with screws.-Overview and history:Equipment designed...
  
  
• Unit Identification, an LED used as a means of locating a specific computer server in a server room