The icositetrachoron is a four-dimensional regular polytope composed of 24 octahedral cells, three of which join at each edge. It is also called a 24-cell because of this. Its Bowers acronym is "ico", and it can also be called a xylochoron. It is one of the three regular polychora that tile 4-dimensional space, leading to the icositetrachoric tetracomb. 

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