#line_like_mark__line  a mark that is long relative to its width; "He drew a line on the chart"; "The substance produced characteristic lines on the spectroscope"
  supertype:  mark  a visible indication made on a surface; "some previous reader had covered the pages with dozens of marks"
  subtype:  cross_hair__crosshair__cross_wire__crosswire  either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration; "he had the target in his cross hairs"
  subtype:  dotted_line  a line made up of dots or dashes; often used to indicate where you are supposed to sign a contract; "just sign on the dotted line"
  subtype:  ascender  (printing) the part of tall lowercase letters that extends above the other lowercase letters
  subtype:  bar_line__barline  a vertical line marking the boundary between musical bars
     subtype:  double_bar  notation marking the end of principal parts of a musical composition; two adjacent bar lines
  subtype:  descender  (printing) the part of lowercase letters that extends below the other lowercase letters
  subtype:  curlicue__squiggle  a short twisting line
  subtype:  spectrum_line  an isolated component of a spectrum formed by radiation at a uniform frequency
  subtype:  trend_line__trendline  a line on a graph indicating a statistical trend
  subtype:  contour_line__contourline__contour  a line drawn on a map connecting points of equal height
     subtype:  thalweg  a line following the lowest points of a valley
  subtype:  guideline.line  a light line that is used in lettering to help align the letters
  subtype:  hairline.line  a very thin line
  subtype:  shaft  a line that forms the length of an arrow pointer
  subtype:  serif__seriph  (printing) a short line at the end of the main strokes of a character
  subtype:  staff_line__staffline  any of the 5 horizontal marks comprising a staff
  subtype:  ledger_line__leger_line__legerline  a short line; a notation for extending the range above or below the staff

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