isom·e·try /aɪˈsɑmətri/
 等容; 等軸; 等軸現象; 同分異構


 isometry
      n 1: the growth rates in different parts of a growing organism
           are the same
      2: a one-to-one mapping of one metric space into another metric
         space that preserves the distances between each pair of
         points; "the isometries of the cube"
      3: equality of elevation above sea level
      4: equality of measure (e.g., equality of height above sea
         level or equality of loudness etc.)