A set of tetrahedrally meshed truncated octahedron with a truncation factor of 0.7, where the truncation factor is the degree to which the base octahedron is truncated. The data set contains a top level directory containing subdirectories with names of the form NpNNNNNN, where N represents a digit (0-9) and p represents a decimal point, these represent truncated octahedra with varying degrees of oblateness (0 < aspect ratio < 1) and prolateness (1 < aspect ratio). Within each directory are files with a numerical file name that represents the size of the geometry in nanometer of equivalent spherical volume diameter. Files with the extension ".pat" represent patran neutral files, and files with extension ".e" are exodusII files (these are also hdf5 compatible). Additionally some directories contain files with ".stderr" and ".stdout" extensions - these are the standard error and standard output of the meshing program used (Coreform Cubit, https://coreform.com/); and "*.cubit" extensions these are the Coreform Cubit scripts used to generate the meshes.