U
- undercomplete autoencoder
- underflow
- underground economy
- underhang
- understanding
- undocumented function
- UNI
- unicast address
- unicity distance
- Unicode
- unidirectional printing
- unidirectional replication
- unification
- unified endpoint management
- uniform grid
- uniform memory access
- uniform sampling
- UNII
- uninitialized variable
- uninstaller
- uninsured traffic
- unit machine
- unit structure
- unit testing
- unitary code
- universal board
- Universal Character Set
- universal plug and play
- universal quantifier
- universal set
- UNIX
- unknown unknowns
- unlabeled data
- unlocked
- unmanaged device
- unmanned sensor
- unmoderated newsgroup
- unpaid internship
- unpredictable
- unprotected
- unregistered user
- unregistered version
- unsafe
- unserviceable
- unsigned integer
- unsolicited behavior
- unsolvable problem
- unstructured data
- unsupervised learning
- untrusted process
