U Uranium
U/S Ultrasonic
UART Universal Asynchronous Receiver/transmitter
UBM Under-bump Metallurgy
UCB Unit Code Browser
UCL Upper Confidence Limit
UCL Upper Control Limit
Ueff Effective Mobility
UEL Upper Explosive Limit
UF Ultra-filtration
UFC Unsaturated Fluorocarbon
UFC Uniform Fire Code
UFL Upper Flammable Limit
UHF Ultra-high Frequency
UHP Ultra-high Purity
UHV Ultra-high Vacuum
UI User Interface
UID User Identification
ULA Uncommitted Logic Array
ULK Ultra Low-k
ULPA Ultra-low Particulate Air
ULSI Ultra Large-scale Integration
UPA Ultraperforming Algorithm
UPH Units Per Hour
UPS Uninterrupted Power Supply
UPS Ultraviolet Photoemission Spectroscopy
UPW Ultrapure Water
URD User Requirement Document
URL Uniform Resource Locator
USART Universal Synchronous/asynchronous Receiver/transmitter
USOP Ultra Small Outline Package
USRD User System Requirement Document
Utt Unattenuated
UTV Unmanned Transport Vehicle
UUT Unit Under Test
UV Ultraviolet

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