#vector  a variable quantity that can be resolved into components
  supertype:  variable_quantity__variable  a quantity that can assume any of a set of values
  subtype:  vector_product__cross_product__crossproduct  a vector that is the product of two other vectors
  subtype:  vector_sum__resultant  a vector that is the sum of two or more other vectors
  subtype:  radius_vector  a line connecting a point in space to the origin of a polar coordinate system
  subtype:  radius_vector.vector__radiusvector  a line connecting a satellite to the center of the body around which it is rotating

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