Technology Glossary : H


  • H320 Standard
    A widely-used video compression standard that allows a wide variety of videoconferencing systems to communicate. H.320 includes a number of...
  • HAC
    Hughes Aircraft Co.
  • HAI
    Helicopter Association International
  • Half Duplex
    Transmitters and receivers send or receive on the same pair of wires.
  • Handover
    the point when an organization accepts that a technology solution is complete and ready for routine usage.
  • Hard drive aka hard disk drive
    a device used to "permanently" store information within a computer, such as programs and data.
  • Hard Drive Hard Disk
    A rigid non-removable disk in a computer and the drive that houses it. Hard disks store more data and can...
  • Hardware
    the computer equipment used to do the work (i.e., operate software programs). It consists of the items you can touch,...
  • HBARO
    Barometric Altitude
  • HDG
    Heading
  • HDOT
    Inertial Vertical Speed
  • HDTV
    High definition (or high resolution) television
  • HE
    Altitude Error
  • Headend
    The electronic control center of a cable sys-tem. This is the site of the receiving antenna and the signal processing...
  • Header Code
    a single string of intelligent digital EAS ASCII data that includes the originator, event, location, time period, and other basic...
  • Hearing Carry Over HCO
    A form of TRS where a person with a speech disability is able to listen to the other end user...
  • Hearing Designation Order HDO
    A Commission term, a Hearing Designation Order institutes a comparative or other adjudicatory hearing proceeding, usually before an Administrative Law...
  • Help desk
    a set of procedures for getting speedy assistance to users concerning the use of a computer. Help may be provided...
  • Hertz
    Frequency in cycles per second
  • Hertz Hz
    A unit of frequency equal to one cycle per second (cps). One kilohertz equals 1000 cps; one megahertz equals 1...
  • HF
    High Frequency
  • Hierarchy
    A set of transmission speeds arranged to multiplex a successively higher number of circuits.
  • HIGH DEFINITION TELEVISION HDTV
    An improved television system which provides approximately twice the vertical and horizontal resolution of existing television standards. It also provides...
  • HIGH DEFINITION TELEVISION HDTV
    An improved television system which provides approximately twice the vertical and horizontal resolution of existing television standards. It also provides...
  • High Definition Television HDTV
    An improved television system which pro-vides approximately twice the vertical and horizontal resolution of the existing television standards. It also...
  • High Definition TV HDTV
    Regular NTSC signals have 525 lines of resolution. HDTV has 1125 lines of resolution having over five times the video...
  • High Frequency HF
    Radio frequencies in the band from 3 to 30 MHz.
  • HIRS
    High-Resolution Infrared Sounder
  • histogram
    A graphical representation of a frequency distribution by means of lines or rectangles that represent class intervals along the x-axis,...
  • Hl
    High
  • Home page
    the introductory page on a Web site that usually contains a table of contents for the site and hot links...
  • Home Satellite Dish HSD
    A home receiver that permits the consumer to receive existing satellite transmissions.
  • Homerun
    A cable run that goes directly from a jack in a wall plate to a centralized position (patch panel). There...
  • Horizontal Consentration
    The share of consumers subscribing to a commonly owned system.
  • horsepower
    a unit of power equal to 33,000 ft.-lb of work per minute.
  • Host
    (n) A computer system that is accessed by a user from a remote location. Typically, the term is used when...
  • Host
    Your Internet access provider
  • Host Computer
    Facility located at the ARTCC which operates user application software, as well as certain peer network layer protocols required to...
  • Host Processor
    End system as defined by ISO that includes the OSI upper layer protocols (i.e., transport layer and above) and application...
  • HP
    Holding Pattern
  • HPRES
    Pressure Altitude
  • HSI
    Horizontal Situation Indicator
  • HTML
    See Hypertext Markup Language.
  • HTML Hyper text markup language
    the formatting language used to create web pages and specify how a page will appear on screen.
  • Hub
    Hubs act as the center of a "star" topology. They have between 4 and 20+ ports. Internally, hubs are "dumb"...
  • Hub
    a device that links all client computers to the server.
  • HUD
    Head-Up Display
  • hue
    the attribute of a color that differentiates it from grey of the same brilliance and that allows it to be...
  • Hybrid Cable
    A cable design to meet many requirements. Most commonly, hybrid cables will contain a mixture of twisted-pair and coaxial, or...
  • Hyper text
    Text that links to other documents that can be retrieved from one document.
  • Hyper Text Mark Up Language HTML
    Hyper-Text Mark-up Language is the programming language used to design and present computer sites on the Internet in a graphical...
  • Hyper Text Transport Protocol HTTP
    The method for moving "hypertext" files across the Internet. Requires an HTTP pro-gram at one end and a server at...
  • hypersonic
    Very fast speed of flight. 3500 - 7000 MPH or Mach 5 to Mach 10. The space shuttle travel this...
  • Hypertext
    text that contains links to other parts of a document, or to documents held on another computer.
  • Hypertext
    Text with links to other text. Documents written as hypertext contain text that when "clicked on" by the user with...
  • Hypertext Markup Language HTML
    A formatting language used to create web pages and specify how a page will appear on screen.
  • HyperText Markup Language HTML
    Set of programming commands inserted around blocks of text that describe how to display it. HTML commands also display other...

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