#indicator  a device for showing the operating condition of some system
  supertype:  #device  an instrumentality invented for a particular purpose; "the device is small enough to wear on your wrist"; "a device intended to conserve water"
  subtype:  #air_sock__airsock__air_sleeve__airsleeve__wind_sock__wind_sleeve  truncated cloth cone used to indicate wind direction
  subtype:  #annunciator  an indicator that indicates which electrical circuit has been active
  subtype:  #cursor__pointer  (computer science) indicator consisting of a movable spot of light (an icon) on a visual display; moving the cursor allows the user to point to commands or screen positions
  subtype:  #dial.indicator  the circular graduated indicator on various measuring instruments
  subtype:  #fuel_gauge__fuel_indicator  an indicator of the amount of fuel remaining in a vehicle
  subtype:  #gnomon  indicator provided by the stationary arm whose shadow indicates the time on the sundial
  subtype:  #spirit_level__level  indicator that establishes the horizontal when a bubble is centered in a tube of liquid
     subtype:  #mason's_level__mason'slevel  a level longer than a carpenter's level
  subtype:  #pilot_light__pilot_lamp__pilotlamp__indicator_lamp__indicatorlamp  indicator consisting of a light to indicate whether power is on or a motor is in operation
  subtype:  #pointer  an indicator as on a dial
     subtype:  #hand  a rotating pointer on the face of a timepiece; "the big hand counts the minutes"
        subtype:  #hour_hand__little_hand  the shorter hand of a clock that points to the hours
        subtype:  #minute_hand__big_hand__bighand  points to the minutes
        subtype:  #second_hand.hand__secondhand  hand marking seconds on a timepiece
           subtype:  #sweep_hand__sweephand__sweepsecond  a second hand that is mounted on the same center as the hour and minute hand and is read on the minutes
     subtype:  #light_pen__electronic_stylus  (computer science) a pointer that when pointed at a computer display senses whether or not the spot is illuminated
     subtype:  #needle.pointer  a slender pointer for indicating the reading on the scale of a measuring instrument
  subtype:  #scale.indicator  an indicator having a graduated sequence of marks
     subtype:  #vernier_scale__vernierscale__vernier  a small movable scale that slides along a main scale; the small scale is calibrated to indicate fractional divisions of the main scale
  subtype:  #test_paper  paper impregnated with an indicator for use in chemical tests
  subtype:  #tidemark  indicator consisting of a line at the high-water or low-water limits of the tides

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