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U Status
U Visa
U(1) Symmetry
U-Pb Dating
U-Rank
U-Value
U.S. Marshals Service
Ubiquitin-Proteasome System
UCC Financing Statement
UDS Diagnostics
Ultimate Limit State
Ultimate Load
Ultrafilter
Ultrafilter Lemma
Ultrafiltration (UF)
Ultrahazardous Activity
Ultrametric Space
Ultrapower
Ultraproduct
Ultraproduct Construction
Ultrasonic Inspection
Ultrasonic Sensor
Ultrasonic Welding
Ultrasound Imaging
Ultraviolet–Visible Spectroscopy
Unauthorized Access to a Computer Network
Unauthorized Access to Computer Network
Unauthorized Access to Computer System
Unauthorized Access to Data
Unauthorized Access to Protected Computer
Unauthorized Computer Access
Unauthorized Data Access
Unauthorized Data Exfiltration
Unauthorized Employment
Unauthorized Interception of Electronic Communication
Unauthorized Syndication