#sound_unit__soundunit  any acoustic unit of measurement
  supertype:  unit_of_measurement  sound.mechanical_phenomenon (pm)
  subtype:  bel__B  a logarithmic unit of sound intensity equal to 10 decibels
  subtype:  decibel__dB__db__db  a logarithmic unit of sound intensity; 10 times the logarithm of the ratio of the sound intensity to some reference intensity
  subtype:  sone  a unit of perceived loudness equal to the loudness of a 1000-hertz tone at 40 dB above threshold
  subtype:  phon  a unit of subjective loudness

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