#domino  a small rectangular block used in playing the game of dominoes; the face of each block has two equal areas that can bear 0 to 6 dots
  supertype:  #block  a solid piece of something (usually having flat rectangular sides); "the pyramids were built with large stone blocks"
  subtype:  #five-spot  a playing card or a domino or a die whose upward face shows five pips
  subtype:  #four-spot  a playing card or domino or die whose upward face shows four pips
  subtype:  #six-spot__sixspot  a playing card or domino or die whose upward face shows six pips

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