Computing
- A Unique identifier
- Unique identifier for a specific User of a computer system
- Unique ID of a message in a folder on an IMAP server
- See also Globally unique identifier (GUID)
- See also Universally unique identifier (UUID)
- User identifier (Unix), a code identifying each user on a Unix and Unix-like systems
- User interface design, 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
- Unit Identification, an LED used as a means of locating a specific computer server in a server room
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