#cardinal_number__cardinalnumber__cardinal  the number of elements in a mathematical set; denotes a quantity but not the order
  supertype:  #number  a concept of quantity derived from zero and units; "every number has a unique position in the sequence"
  subtype:  #absolute_frequency__frequency  the number of observations in a given statistical category
  subtype:  #googol  a cardinal number represented as 1 followed by 100 zeros (ten raised to the power of a hundred)
  subtype:  #googolplex  a cardinal number represented as 1 followed by a googol of zeros (ten raised to the power of a googol)

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