A truncated polyhedron is a polyhedron with truncated faces, given by the Schläfli symbol t.
The operation implemented as Truncate[polyhedron, r] in the Wolfram Language package PolyhedronOperations` displaces points along the edges of a polyhedron by a ratio , where is the fraction of the edge length at which to truncate, and then fills in the resulting holes with new polygons. While this is not true truncation, the operation is equivalent to truncation for regular solids and . The operation is implemented in the Wolfram Language as TruncatedPolyhedron[poly].