UID

UID may refer to:

Identifying numbers

• Unique identifier and instances or systems thereof

In computing

• Unique identifier for a specific user of a computer system
• Unique ID for the Mifare series of chips (integrated circuits) used in contactless smart cards and proximity cards.
• Unique ID of a message in a folder on an IMAP server
• User identifier (Unix), a code identifying each user on a Unix and Unix-like systems
• Globally unique identifier (GUID)
• Universally unique identifier (UUID)

In other areas

• PubMed 'Unique Identifier' parameter (PMID) designating specific scientific publication abstracts (PubMed § PubMed identifier)
• 'Unique Item Identifier', a specific value in the IUID (Item Unique Identification) system used by the United States Department of Defense for the identification of accountable equipment according to DoD Instruction 5000.64
• Aadhaar number, originally the Unique Identification Number, an initiative of the Unique Identification Authority of India (UIDAI) of the Indian government to create a unique ID for every Indian resident
• uID Center, a nonprofit organization in Tokyo, Japan, responsible for the Ucode system for uniquely identifying real-world objects electronically
• VAT identification number, in the German language (VAT = value-added tax)

Organizations

• Ulster Institute for the Deaf
• Umeå Institute of Design
• Unitedworld Institute of Design, college in India

Other uses

• Unidentified decedent, a deceased person whose body has not yet been identified
• Unintelligent Design, a satirical reaction to the Intelligent Design movement
• Unit Identification, an LED used as a means of locating a specific computer server in a server room
• Universal Instructional Design, an educational method that tries to deliver teaching to meet the needs of wide variety of learners
• User interface design, device design with the focus on the user's experience and interaction