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U	uranium
UBM	under-bump metallurgy
UCL	upper confidence limit; upper control limit
UF	ultra-filtration
UHF	ultrahigh frequency
UHP	ultrahigh purity
UHV	ultrahigh vacuum
UID	user identification
ULA	uncommitted logic array
ULK	ultralow-k
ULPA	ultralow particulate air
ULSI	ultralarge-scale integration uph units per hour
UPW	ultrapure water
USART	universal synchronous/ asynchronous receiver/transmitter
USOP	ultrasmall outline package
Utt	unattenuated
UV	ultraviolet