Acronym ...
Name 2rahi+2400tet (?)
Circumradius sqrt[(21+9 sqrt(5))/2] = 4.534568
General of army rahi
Colonel of regiment rahi
Confer
non-Grünbaumian master:
rahi  
Grünbaumian relatives:
2rahi  

Looks like a compound of 2 rectified hecatonicosachora (rahi) with 2400 additional tetrahedra (tet). In this "look" tetrahedra coincide by 6 each.


Incidence matrix according to Dynkin symbol

o3o3β5β

both( . . . . ) | 2400 |    6    6 |    3    3    3    9 |   1   3    4
----------------+------+-----------+---------------------+-------------
sefa( . o3β . ) |    2 | 7200    * |    1    0    1    1 |   1   1    1
sefa( . . s5s ) |    2 |    * 7200 |    0    1    0    2 |   0   2    1
----------------+------+-----------+---------------------+-------------
      . o3β .       3 |    3    0 | 2400    *    *    * |   1   1    0
both( . . s5s )     5 |    0    5 |    * 1440    *    * |   0   2    0
sefa( o3o3β . ) |    3 |    3    0 |    *    * 2400    * |   1   0    1
sefa( . o3β5β ) |    3 |    1    2 |    *    *    * 7200 |   0   1    1
----------------+------+-----------+---------------------+-------------
      o3o3β .       4 |   12    0 |    4    0    4    0 | 600   *    *
      . o3β5β      60 |   60  120 |   20   24    0   60 |   * 120    *
sefa( o3o3β5β )     4 |    3    3 |    0    0    1    3 |   *   * 2400

starting figure: o3o3x5x

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