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Bitruncation
Operation in Euclidean geometry / From Wikipedia, the free encyclopedia
In geometry, a bitruncation is an operation on regular polytopes. The original edges are lost completely and the original faces remain as smaller copies of themselves.
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/16/Birectified_cube_sequence.png/640px-Birectified_cube_sequence.png)
![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/a/a9/Bitruncated_cubic_honeycomb.png/640px-Bitruncated_cubic_honeycomb.png)
Bitruncated regular polytopes can be represented by an extended Schläfli symbol notation t1,2{p,q,...} or 2t{p,q,...}.