Gyrochoron

A gyrochoron is an isochoric polychoron formed as the dual to the step prism.

Examples
5-2: Pentachoron

6-2: 3-3 duoprism

7-2 and 7-3: 7-2 gyrochoron

8-2: 8-2 gyrochoron

8-3: Tesseract

9-2 and 9-4: 9-2 gyrochoron

9-3: 9-3 gyrochoron

10-2: 10-2 gyrochoron

10-3: Decachoron

10-4: 5-5 duoprism