1. 
   Tsubo
   Japanese words つぼ have the following meanings: ...
   Found op http://en.wikipedia.org/wiki/Tsubo
   
   
2. 
   tsubo
   an informal unit of area used in Japan to measure area inside buildings. One tsubo is an area of about 3.3 square meters (3.95 square yards), an area that can be covered neatly by two traditional tatami mats. See tatami, above.
   Found op http://www.unc.edu/~rowlett/units/dictT.html
   
   

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