#angular_unit__angularunit  a unit of measurement for angles
  supertype:  spatial_unit_of_measure (pm)  unit_of_measurement  angle (pm)
  subtype:  mil.angular_unit  an angular unit used in artillery; equal to 1/6400 of a complete revolution
  subtype:  arcdegree__degree  a measure for arcs and angles; "there are 360 degrees in a circle"
  subtype:  arcsecond__second  a 60th part of a minute of arc; "the treasure is 2 minutes and 45 seconds south of here"
  subtype:  minute_of_arc__minute__arcminute  a unit of angular distance equal to a 60th of a degree
  subtype:  microradian  a unit of angular distance equal to one thousandth of a milliradian
  subtype:  milliradian  a unit of angular distance equal to one thousandth of a radian
  subtype:  radian__rad  the unit of plane angle adopted under the System International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
  subtype:  grad__grade  one-hundredth of a right angle
  subtype:  oxtant  a unit of angular distance equal to half a quadrant
  subtype:  sextant.angular_unit  a unit of angular distance equal to 60 degrees
  subtype:  quadrant.angular_unit__right_angle__rightangle  a quarter of the circumference of a circle
  subtype:  straight_angle  an angle of 180 degrees
  subtype:  steradian__sr  the unit of solid angle adopted under the System International d'Unites

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