In four-dimensional geometry, a runcinated 24-cell is a convex uniform polychoron, being a runcination (a 3rd order truncation) of the regular 24-cell.
There are 3 unique degrees of runcinations of the 24-cell including with permutations truncations and cantellations.
Read more about Runcinated 24-cell: Runcinated 24-cell, Runcitruncated 24-cell, Omnitruncated 24-cell, Related Polytopes