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  • U.S.A.R

    Urban Search and Rescue.

  • UHF

    Ultrahigh frequency; the portion of the radio frequency spectrum between 300 and 3,000 mHz.

  • UL listing

    A certification standard. This listing means the product has been safety certified by the Underwriter’s Laboratory.

  • ulcer

    An open lesion of the skin or mucous membrane.

  • ulna

    The larger bone of the forearm, on the side opposite that of the thumb.

  • Ultimate Capacity

    Total capacity of water supply system, including residential and industrial consumption, available fire flow, and all other taxes on the system.

  • umbilical cord

    A flexible structure connecting the fetus to the placenta.

  • umbilicus

    The navel; the "bellybutton".

  • unconscious

    A state of being insensible or comatose.

  • Under Control

    Fire or spill etc. is no longer spreading. The situation is contained. This term should not be confused with a report that the fire is out.

  • Undercarriage

    Portion of a vehicle’s frame that is located beneath the vehicle.

  • Underground storage tank

    A tank that happens to be underground.

  • Understory burn

    A controlled burn of fuels below the forest canopy, intended to remove fuels from on-coming or potential fires.

  • Underwriters Laboratories Inc. (UL)

    Independent fire research and testing laboratory

  • Underwriters Laboratories Inc. (UL)

    Independent fire research and testing laboratory

  • unifocal

    Arising from a single site.

  • Unincorporated

    Portion of a state/province outside the jurisdiction of municipalities that does not provide an inspection program

  • Unincorporated

    Portion of a state/province outside the jurisdiction of municipalities that does not provide an inspection program

  • United States Fire Administration (USFA)

    Division of the Federal Emergency Management Agency (FEMA), which in turn is managed by the Department of Homeland Security (DHS).

  • Universal precautions

    The use of safety barriers (gloves, mask, goggles) to limit an emergency responder’s contact with contaminants, especially fluids of injured patients.

  • Unlined Hose

    Fire hose without a rubber lining; most frequently used in interior standpipe systems and in wildland firefighting.

  • Unloading Site

    Place in the water shuttle operation where tankers unload their water into portable tanks. Also called the Dump Site.

  • unstable angina

    (preinfarction angina) Angina pectoris characterized by a changing, unpredictable pattern of pain, which often signals an impending acute myocardial infarction.

  • Upper Flammable Limit (UFL)

    Upper limit at which a flammable gas or vapor will ignite; above this limit, the gas or vapor is too rich (lacks the proper quantity of oxygen) to burn

  • Upper Flammable Limit (UFL)

    Upper limit at which a flammable gas or vapor will ignite; above this limit, the gas or vapor is too rich (lacks the proper quantity of oxygen) to burn

  • Urban interface

    The Interface zone where man-made structures inter-mingle with wildlands, creating risk of structural involvement in a wildland fire incident and wildland fire involvement in structure fires, each of which requires different equipment, training and tactics.

  • uremia

    A toxic condition caused by the inability of the kidneys to remove waste products of metabolism.

  • ureter

    The tube leading from the kidney to the bladder.

  • urethra

    The tube leading from the bladder to the outside of the body.

  • URI

    An abbreviation for upper respiratory infection.

  • urine

    The fluid secreted by the kidneys, stored in the bladder, and discharged through the urethra.

  • urticaria

    Hives.

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