#standard_deviation  the square root of the variance
  supertype:  #variance  the second moment around the mean; the expected value of the square of the deviations of a random variable from its mean value
     supertype:  #moment.statistic  the n-th moment of a distribution is the expected value of the n-th power of the deviations from a fixed value
        supertype:  #statistic  a datum that can be represented numerically
           supertype:  #datum__data_point  an item of factual information derived from measurement or research
              supertype:  #information  knowledge acquired through study or experience or instruction
                 supertype:  pm#thing_that_can_be_seen_as_a_relation  usable as relation type
                    supertype:  pm#thing_playing_some_role  category to classify things according to roles/viewpoints; classification under this category is application-dependant
                       supertype:  pm#thing__something___T__t___3D_or_4D_thing_or_anything_else  any category (type or individual) is instance of this type; any type is also a subtype of this type

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