- U
- U interface
- U-band
- u-Law
- U-NNI
- U.S. Robotics
- U160
- U3
- U320
- U3D
- UA
- UAC
- UAE
- UART
- UART overrun
- UAT
- UBE
- ubiquitous
- UBL
- UBM
- UBR
- Ubuntu
- uC
- UCAID
- UCC 2B
- UCE
- UCITA
- ucp
- UCR
- UCS
- UCS-2
- UCS-4
- UCSD p-System
- UDA
- UDB
- UDDI
- UDF
- UDI
- UDMA
- UDO
- UDP
- UDP hole punching
- UDP/IP
- UEFI
- UFD
- UFO
- UFS
- UGC
- ugly code
- UHDTV
- UHDV
- UHF
- UHF spectrum
- UHF tag
- UI
- UI builder
- UI designer
- UI specialist
- UIDL
- UIMX
- UL
- UL/DL
- UL/DL ratio
- ULAW
- ULP
- ULS server
- ULSI
- Ultimate
- UltimateTV
- Ultra ATA
- Ultra DMA
- Ultra DMA/100
- Ultra DMA/33
- Ultra DMA/66
- Ultra HD
- Ultra HDTV
- ultra high frequency
- Ultra IDE
- Ultra Mobile Broadband
- ultra portable laptop
- ultra portable PC
- Ultra SCSI
- Ultra-Mobile PC
- ultra-wideband
- Ultra2 SCSI
- Ultra3 SCSI
- Ultra4 SCSI
- ultracap
- ultracapacitor
- UltraCard
- ultrafiche
- UltraJava
- ultraportable laptop
- ultraportable PC
- UltraSPARC
- ultraviolet
- UltraVNC
- ultrawideband
- Ultrium
- ULTRIX
- UM
- UMA
- UMB
- umbrella term
- UMD
- UML
- UMOS
- UMPC
- UMS
- UMTS
- unary
- unbalanced line
- unbundle
- unbundling
- UNC
- uncached speed
- unchannelized
- unchecked buffer
- unconditional branch
- uncore
- undefined variable
- undelete
- under cover removal
- underflow
- Undernet
- underrun
- underscan
- underscore
- undo
- unformatted
- UNI
- Unibus
- unicast
- unicast routing protocol
- Unicenter
- Unices
- Unicode
- UniData
- unidirectional
- UNIFACE
- unified communications
- unified display interface
- unified messaging
- Unified Modeling Language
- unified storage
- unified threat management
- Uniform Resource Locator
- UniForum
- UNIFY 2000
- Unify NXJ
- Unify VISION
- Unimodem
- uninstall
- uninstaller
- Uninterruptible Application Error
- uninterruptible power supply
- union
- uniprocessor
- unique visitors
- unique visits
- UniSQL
- Unisys
- unit record equipment
- unit test
- United Online
- UnitedLinux
- UNIVAC I
- UniVBE
- Univel
- universal binary
- universal cable recognition
- universal client
- Universal DSL
- Universal Media Disc
- Universal Naming Convention
- Universal Plug and Play
- universal port replicator
- Universal Product Code
- universal remote control
- Universal Serial Bus
- universal server
- universal time
- UniVerse
- Unix
- UNIX 03
- UNIX 93
- UNIX 95
- UNIX 98
- Unix based
- Unix box
- Unix curses
- Unix History
- Unix International
- Unix like
- Unix server
- Unix shell account
- Unix socket
- Unix to Unix copy
- Unix/DOS command comparison
- Unix/X
- UnixWare
- unlicensed band
- unload
- unlock
- unlock iPhone
- unlocked phone
- UNMA
- unmanaged code
- unmanaged hub
- unmark
- unpack
- unprintable characters
- unqualified address
- unresolved
- unscramble
- unshielded twisted pair
- unstructured data
- unsubscribe
- untethered
- Unununium
- Unununium time
- unzip
- uop
- up
- UP technology
- UP.Browser
- UP.Link Server
- UPA
- UPC
- upconversion
- upconvert
- upconverting
- upconverting DVD
- upconverting receiver
- update
- updates to this encyclopedia
- upgradable
- upgrade
- upgradeable
- upgrading this software
- uplink
- uplink port
- upload
- uploading
- UPMC
- UPnP
- upper ASCII
- upper CASE
- upper memory
- Upper Memory Area
- Upper Memory Block
- UPS
- upsample
- upsampling
- upscale
- upstream
- uptime
- upward compatible
- urban legend
- urban myth
- URI
- URI scheme
- URL
- URL hijacking
- URL mapping
- URL poisoning
- URL redirecting
- URL redirector
- URL shortener
- URL shortening
- URL switch
- URN
- US ISPA
- US-CERT
- usability
- usability lab
- usage mining
- USART
- USB
- USB 1.0
- USB 1.1
- USB 2.0
- USB 3.0
- USB adapter
- USB device class
- USB dongle
- USB drive
- USB drive kit
- USB flash drive
- USB hard drive
- USB hub
- USB key
- USB key drive
- USB keydrive
- USB memory
- USB modem
- USB OTG
- USB pad
- USB phone
- USB port
- USB port replicator
- USB printer
- USB stick
- USB switch
- USB thumb drive
- USB token
- USB toy
- USB turntable
- USB wireless dongle
- USB-to-SCSI adapter
- USCD p-System
- use case
- use-case analysis
- used computers
- Usenet
- USENIX
- user
- user acceptance test
- user account
- User Account Control
- user agent
- user agent spoofing
- user agent string
- user area
- user authentication
- user authorizations
- user centric
- User Datagram Protocol
- user default profile
- user defined
- user facing
- user friendly
- user generated
- user group
- user ID
- user input terminal
- user interface
- user interface control
- user management and provisioning
- user name
- user network
- user permissions
- user privileges
- user profile
- user provisioning
- user reviews
- user rights
- user script
- user session
- user sessions
- user space
- user support
- user-centric ID
- user-centric identity management
- user-generated content
- user-generated reviews
- user-level security
- USER.DAT
- userid
- username
- userspace
- USG
- USL
- USO
- USOC
- USPS
- USR
- USRobotics
- USRT
- USSD
- UTC
- UTF
- UTF-16
- UTF-32
- UTF-7
- UTF-8
- UTG
- utilities
- utility
- utility computing
- utility program
- utility software
- UTM
- UTP
- UTP Ethernet
- UTRAN
- UTS
- UUcoding
- UUCP
- UUdecode
- UUencode
- UUID
- UUNET
- UV
- UV filter
- UWB
- UWC Consortium
- UWC-136
- UWCC
- UXGA
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