Octagonal duoprism

The 8-8 duoprism is a noble uniform duoprism that consists of 16 octagonal prisms and 64 vertices. It is also the 16-7 gyrochoron.

The 8-8 duoprism can be vertex-inscribed into a small rhombated tesseract or small prismatotetracontoctachoron.

This polychoron can be alternated into a 4-4 duoantiprism, although it cannot be made uniform. The octagons can also be alternated into long rectangles to create a bialternatosnub 4-4 duoprism, which is also nonuniform.