#isogram__isopleth__isarithm  a line drawn on a map connecting points having the same numerical value of some variable
  supertype:  line.location  a spatial location defined by a real or imaginary unidimensional extent
  subtype:  isobar  an isogram connecting points having equal barometric pressure at a given time
  subtype:  isochrone  an isogram connecting points at which something occurs or arrives at the same time
  subtype:  isohel  an isogram connecting points receiving equal amounts of sunshine
  subtype:  isotherm  an isogram connecting points having the same temperature at a given time

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