Is it ensure, insure, or assure?
|geodesic dome |
A domed or vaulted structure of straight elements that form interlocking polygons.
spherical form in which lightweight triangular or polygonal facets consisting of either skeletal struts or flat planes, largely in tension, replace the arch principle and distribute stresses within the structure itself. It was developed in the 20th century by American engineer and architect R. Buckminster Fuller.