Acronym sesidip Name small-snub-icosicosidodecahedron prism Circumradius sqrt[17+3 sqrt(5)+sqrt[102+46 sqrt(5)]]/4 = 1.541531 Colonel of regiment (is itself locally convex – no other uniform polyhedral members) Externallinks

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

Incidence matrix according to Dynkin symbol

```x s5/2s3s3*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*b ) |   2 |  *   * 120   * |  0  1  0  0  1  0   1 |  0  1  0  1 1
. sefa( .   s3s    ) |   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*b ) |   4 |  2   0   2   0 |  * 60  *  *  *  *   * |  0  1  0  1 0
x sefa( .   s3s    ) |   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*b   ♦   3 |  0   0   3   0 |  *  *  *  * 40  *   * |  0  1  0  0 1
.       .   s3s      ♦   3 |  0   0   0   3 |  *  *  *  *  * 40   * |  0  0  1  0 1
. sefa( s5/2s3s3*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*b   ♦   6 |  3   0   6   0 |  0  3  0  0  2  0   0 |  * 20  *  * *
x       .   s3s      ♦   6 |  3   0   0   6 |  0  0  3  0  0  2   0 |  *  * 20  * *
x sefa( s5/2s3s3*b ) ♦   6 |  3   2   2   2 |  1  1  1  0  0  0   2 |  *  *  * 60 *
.       s5/2s3s3*b   ♦  60 |  0  60  60  60 |  0  0  0 12 20 20  60 |  *  *  *  * 2
```