Acronym	griphi
Name	great retropental hecatonicosachoron
Cross sections	©
Circumradius	sqrt[(5-sqrt(5))/2] = 1.175571
General of army	rox
Colonel of regiment	ragishi
Face vector	720, 3600, 1920, 120
Confer	general polytopal classes: noble polytopes
External links

As abstract polytope griphi is isomorphic to mriphi, thereby replacing decagrams by decagons, resp. by replacing giddy by siddy.

Incidence matrix

720 |   10 |   10  10 |  10
----+------+----------+----
  2 | 3600 |    2   2 |   4
----+------+----------+----
  6 |    6 | 1200   * |   2
 10 |   10 |    * 720 |   2  {10/3}
----+------+----------+----
 60 |  120 |   20  12 | 120  giddy