#factor.number  any of the numbers (or symbols) that form a product when multiplied together
  supertype:  #number  a concept of quantity derived from zero and units; "every number has a unique position in the sequence"
  subtype:  #deflator  a statistical factor designed to remove the effect of inflation; inflation adjusted variables are in constant dollars
  subtype:  #conversion_factor  factor by which a quantity that is expressed in one set of units must be multiplied in order to convert it into another set of units
  subtype:  #factor_of_proportionality__constant_of_proportionality  the constant value of the ratio of two proportional quantities x and y; usually written y = kx, where k is the factor of proportionality
     subtype:  #Planck's_constant__h  the constant of proportionality relating the energy of a photon to its frequency; approximately 6.626 x 10\-34 joule-second

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