Glossary

U

uranium

UART

universal asynchronous reciever/transmitter

UBM

under-bump metallurgy

UCL

upper confidence limit; upper control limit

UEL

upper explosive limit

UF

ultra-filtration

UFL

upper flammable limit

UHF

ultrahigh frequency

UHP

ultrahigh purity

UHV

ultra-high vacuum

UI

user interface

UID

user identification

ULA

uncommitted logic array

ULPA

ultra-low particulate air

ULSI

ultra-large-scale integration

UPH

units per hour

UPW

ultrapure water

URL

uniform resource locator

U/S

ultrasonic

USART

universal synchronous/asynchronous receiver/transmitter

USOP

ultra small outline package

Utt

unattenuated

UUT

unit under test

UV

ultraviolet