1. 
   Dreikanter
   A Dreikanter is a type of ventifact that typically forms in desert or periglacial environments due to the abrasive action of blowing sand. Dreikanters exhibit a characteristic three-faced pyramidal shape. The word Dreikanter is a German word meaning "a three-sider." ...
   Found op http://en.wikipedia.org/wiki/Dreikanter
   
   
2. 
   dreikanter
   (from the article `ventifact`) ...wind direction. As one surface is cut, the stone may become out of balance and may turn to expose another surface to the wind. A ventifact that ...
   Found op http://www.britannica.com/eb/a-z/d/74
   
   

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