u CHART
The c CHART, assumes that the probability of an occurrence ( for example an accident )
is the same for each day.    The Control Chart used where the opportunity for an occurrence
is not the same is called the u CHART.    EXAMPLE:  The monthly number of bottle jams
per finishing line, the number of finishing lines running from month to month.

UCL
UPPER CONTROL LIMIT. A line drawn at a calculated distance above the central line
which represents the maximum variation that could be expected if only normal causes of variation are present.

UEL
UPPER EXPLOSIVE LIMIT

UHMWPE
ULTRAHIGH MOLECULAR WEIGHT POLYETHYLENE

UHV
ULTRAHIGH VACUUM

UIC
UNDERGROUND INJECTION CONTROL

UL
UNDERWRITERS LABORATORY

ULEV
ULTRALOW EMISSION VEHICLES

UNCED
UNITED NATIONS CONFERENCE ON ENVIRONMENT AND  DEVELOPMENT

UNDP
UNITED NATIONS DEVELOPMENT PROGRAM

UNEP
UNITED NATIONS ENVIRONMENT PROGRAM

UOS
UNIVERSAL OPERATOR STATIONS

USABC
UNITED STATES ADVANCED BATTERY CONSORTIUM

USACA
UNITED STATES ADVANCED CERAMICS ASSOCIATION

USACE
U.S. ARMY CORP OF ENGINEERS

USAGE
An amount of chemicals used by a process due to REACTION
DRAG-OUT  EVAPORATION  AND SPILLAGE WHILE WORK IS BEING PROCESSED.

USAID
UNITED STATES AGENCY FOR INTERNATIONAL  DEVELOPMENT

USCAR
UNITED STATES COUNCIL FOR AUTOMOTIVE RESEARCH

USGS
UNITED STATES GEOLOGICAL SURVEY

USL
UPPER SPECIFIED LIMITS

USOW
UNDERGROUND SOURCES OF DRINKING WATER

USPIRG
U.S. PUBLIC INTEREST RESEARCH GROUP

UST
UNDERGROUND STORAGE TANKS

UTM
UNIVERSAL TESTING MACHINE

UTS
ULTIMATE TENSILE STRENGTH

UV
ULTRAVIOLET