tatami "box seat" for four people at sumo, kabuki, etc.
 measure;  square (e.g. of graph paper or Japanese manuscript paper);  box (e.g. on a form)
 square (shape);  (in a castle) rectangular space between the inner and outer gates (where troops can gather)
 18-litre measuring container
 18-litre measuring container
 selling something by the boxful (in a wooden masu box)