Acronym	sisp
Name	small swirlprism
	©
Cross sections	©
Circumradius	(1+sqrt(5))/2 = 1.618034
Colonel of regiment	sub-regimental to ex
Face vector	120, 720, 720, 120
Confer	more general: n-gad-swirl   uniform relative: ex   gap   segmentochora: pappy   related scaliform: gisp   general polytopal classes: noble polytopes
External links

This one can be obtained by chopping off the vertices of an ex in a similar way along cycles, as is done for gap. Accordingly those vertex pyramids (ikepy) would intersect themselves, resulting in pappy instead. Instead of using just 2 cycles (as for gap), here 12 such swirling cycles are used, leaving no tet any more.

The sisp vertex figure is a faceting of ike, having 10 (x,x,x,f)-trapezia.

As abstract polytope sisp is isomorph to gisp, thereby replacing pentagons by pentagrams, resp. replacing pap by starp.

Incidence matrix

120 |  10   2 |  15   5 |  10
----+---------+---------+----
  2 | 600   * |   2   1 |   3
  2 |   * 120 |   5   0 |   5
----+---------+---------+----
  3 |   2   1 | 600   * |   2
  5 |   5   0 |   * 120 |   2  : {5}
----+---------+---------+----
 10 |  15   5 |  10   2 | 120  : pap