Acronym	sirsiddip
Name	small-(inverted)-retrosnub-icosicosidodecahedron prism
Cross sections	©
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)
Face vector	120, 420, 404, 114
External links

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