Acronym sirsiddip Name small-(inverted)-retrosnub-icosicosidodecahedron prism Circumradius sqrt[17+3 sqrt(5)-sqrt[102+46 sqrt(5)]]/4 = 0.766294 Colonel of regiment (is itself locally convex – no other uniform polyhedral members) Externallinks

As abstract polytope sirsiddip is isomorphic to sesidip, thereby replacing retrrograde icosahedral triangles by prograde ones, resp. replacing sirsid by seside.

Incidence matrix according to Dynkin symbol

```x s5/2s3/2s3/2*b

. demi( .   .   .      ) | 120 |  1   2   2   2 |  2  2  2  1  1  1   3 |  1  1  1  3 1
-------------------------+-----+----------------+-----------------------+--------------
x demi( .   .   .      ) |   2 | 60   *   *   * |  2  2  2  0  0  0   0 |  1  1  1  3 0
. sefa( s5/2s   .      ) |   2 |  * 120   *   * |  1  0  0  1  0  0   1 |  1  0  0  1 1
. sefa( s   .   s3/2*b ) |   2 |  *   * 120   * |  0  1  0  0  1  0   1 |  0  1  0  1 1
. sefa( .   s3/2s      ) |   2 |  *   *   * 120 |  0  0  1  0  0  1   1 |  0  0  1  1 1
-------------------------+-----+----------------+-----------------------+--------------
x sefa( s5/2s   .      ) |   4 |  2   2   0   0 | 60  *  *  *  *  *   * |  1  0  0  1 0
x sefa( s   .   s3/2*b ) |   4 |  2   0   2   0 |  * 60  *  *  *  *   * |  0  1  0  1 0
x sefa( .   s3/2s      ) |   4 |  2   0   0   2 |  *  * 60  *  *  *   * |  0  0  1  1 0
.       s5/2s   .        ♦   5 |  0   5   0   0 |  *  *  * 24  *  *   * |  1  0  0  0 1
.       s   .   s3/2*b   ♦   3 |  0   0   3   0 |  *  *  *  * 40  *   * |  0  1  0  0 1
.       .   s3/2s        ♦   3 |  0   0   0   3 |  *  *  *  *  * 40   * |  0  0  1  0 1
. sefa( s5/2s3/2s3/2*b ) |   3 |  0   1   1   1 |  *  *  *  *  *  * 120 |  0  0  0  1 1
-------------------------+-----+----------------+-----------------------+--------------
x       s5/2s   .        ♦  10 |  5  10   0   0 |  5  0  0  2  0  0   0 | 12  *  *  * *
x       s   .   s3/2*b   ♦   6 |  3   0   6   0 |  0  3  0  0  2  0   0 |  * 20  *  * *
x       .   s3/2s        ♦   6 |  3   0   0   6 |  0  0  3  0  0  2   0 |  *  * 20  * *
x sefa( s5/2s3/2s3/2*b ) ♦   6 |  3   2   2   2 |  1  1  1  0  0  0   2 |  *  *  * 60 *
.       s5/2s3/2s3/2*b   ♦  60 |  0  60  60  60 |  0  0  0 12 20 20  60 |  *  *  *  * 2
```

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