Clerical error in Addons Regular Solids, Tetrakis hexahedron, NOT Triakis Hexahedron.

(1) Blender User Preferences -> Addons -> And Mesh -> Choose Regular Solids
(2) 3D View -> Add -> Mesh -> Solids -> Catalan -> Triakis Hexahedron

It is a clerical error, It should be Tetrakis hexahedron — Tetrakis, NOT Triakis

See also:

thanks for the heads up, I’ll fix this soon.

Sounds Greek either way, so jammas!

In 2.73 it is not there…
You can find it here: ore into MATH MESH Haddon into SOLID.