Acronym  sisp 
Name  small swirlprism 
©  
Cross sections 
© 
Circumradius  (1+sqrt(5))/2 = 1.618034 
Colonel of regiment  subregimental to ex 
Confer 

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.
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
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