Technology Glossary : U


  • UA
    United
  • UHF
    Ultra-high Frequency
  • UL
    Abbreviation for Underwriters Laboratories, a nonprofit independent organization, which operates a testing and listing service for electrical and electronic materials...
  • Ultra High Frequency UHF
    Radio frequencies in the band from 300 to 3,000 MHz.
  • Ultra High Frequency UHF
    The part of the radio spectrum from 300 to 3000 megahertz that includes TV channels 14-83, as well as many...
  • ultraviolet radiation
    Electromagnetic radiation of shorter wavelength than visible radiation but longer than X-rays; roughly, radiation in the wavelength interval between 10...
  • umbra
    The complete or perfect shadow of an opaque body, as a planet, where the light from the source of illumination...
  • UNBUNDLING
    The term used to describe the access provided by local exchange carriers so that other service providers can buy or...
  • UNBUNDLING
    The term used to describe the access provided by local exchange carriers so that other service providers can buy or...
  • Unbundling
    Unbundling is the term used to describe the access provided by local exchange carriers so that other service providers may...
  • uncontrolled mosaic
    A mosaic made without correction for distortion or displacement of any type.
  • Undue burden
    Undue burden means significant difficulty or expense. In determining whether an action would result in an undue burden, an agency...
  • uniform grid
    Square, rectangular, or, more rarely, hexagonal lattice for recording geographical data, The simpler grids are usually not related to geodetic...
  • Uniformed Resource Locator URL
    The standard way to give the address of any resource that is on the Internet and is part of the...
  • Universal Resource Locator URL
    A World Wide Web address composed of several parts including the protocol, the server where the "resource" (e.g., web page)...
  • UNIVERSAL SERVICE
    The financial mechanism which helps compensate telephone companies or other communications entities for providing access to telecommunications services at reasonable...
  • UNIVERSAL SERVICE
    The financial mechanism which helps compensate telephone companies or other communications entities for providing access to telecommunications services at reasonable...
  • Universal Service
    This term describes the financial support mechanisms that constitute a universal fund which helps compensate telephone companies or other communication...
  • Universal Transverse Mercator UTM
    A widely used map projection employing a series of identical projections around the world in the intermediate latitudes, each covering...
  • Upgrade
    to install a higher version or release of software on a computer system, or to add memory or newer types...
  • Uplink
    The signal that carries information from an earth station source up to a satellite.
  • Uplink Downlink
    Programs are "uplinked" to the satellite transponder and "downlinked" to the ground receiving dish.
  • Upload
    To send a text file or software program via telecommunications to another computer (See Download).
  • Uploading
    The transfer of copies of a file from the user's own computer to a remote database or other computer. The...
  • URL
    See Uniform Resource Locator.
  • URL Uniform resource locator
    a World Wide Web address composed of several parts including the protocol, the server where the resource resides, the path...
  • URLs Uniform Resource Locators
    Pronounced "earls". The address system used by the Internet to locate resources such as web sites. An URL includes the type of...
  • US
    USAir
  • USAF
    United States Air Force
  • USDLA
    US Distance Learning Association.
  • Usenet Groups
    Usenet groups are also known as newsgroups, or discussion groups. Users exchange information generally provided in a "chat room."
  • Users
    the people who use technology as a tool to do their jobs. Typically users include instructional staff who provide instruction...
  • USGS
    United States Geological Survey
  • UTC
    Coordinated Universal Time, the world-wide common time standard that is used in EAS headers for time stamp.
  • Utility software
    computer programs that help to manage, recover, and back up files.
  • UTP
    Unshielded Twisted Pair.

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