U
- U
- U interface
- U2F authentication
- U3A
- UA
- UART
- UAS
- UAV
- UBA
- UBER
- ubiquitous computing
- UBR
- UCB
- UCL
- UCLA
- UCS
- UDDI
- UDF
- UDP
- UEBA
- UEFI
- UGV
- UHD-BD
- UHDTV
- UHF
- UI-frame
- UICC
- UID
- UIMS
- ULSI
- ultrabook
- ultrasonic sensor
- UM
- UMA
- umbrella term
- UML
- UML diagram
- UMTS
- unary operation
- unauthorized
- unauthorized access
- unavailable time
- unbalanced parentheses
- unbiased renderer
- unbuffered memory
- uncertainty
- unconditional branch
- unconference
- undefined
- undefined instruction
