Letter U

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UBC Uniform Building Code
UEL Upper Explosive Limit
UFC Uniform Fire Code
UGST Underground Storage Tank
UGT Underground Tank
UIC Underground Injection Control, H&S Code Section 2515910, SDWA, RCRA
UL Underwriter's Laboratories, one of a number of agencies that test and approve various products for safety and then permit the manufacturer to display their seal on the product as an indication of that testing.
ULC Underwriter's Laboratory of Canada
ULPA Ultra-Low Penetration Air (filtration)
UM Uniform Manifest
UN United Nations
US EPA United States Environmental Protection Agency
USC United States Code
USCG United States Coast Guard
USDA United States Department of Agriculture
USDW Underground Source of Drinking Water (SDWA)
USFDA United States Food and Drug Administration
USM United States Marchal
USP United States Pharmacopoeia
UST Underground Storage Tank
UV Ultraviolet
UV Ultraviolet (EM radiation slightly higher in energy than visible)
UVCE Unconfined Vapor Cloud Explosion
UV-Vis UltraViolet-Visible Spectroscopy in the visible and higher energies of light.

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