Acronym  didpy, pt  did 
Name  (degenerate) did pyramid 
Segmentochoron display  
Circumradius  ∞ i.e. flat in euclidean space 
Dihedral angles  
Confer 

It either can be thought of as a degenerate 4D segmentotope with zero height, or as a 3D euclidean decomposition of the larger base into smaller bits.
Incidence matrix according to Dynkin symbol
oo5ox5/2oo&#x → height = 0 (pt  did) o.5o.5/2o.  1 * ♦ 30 0  60 0 0  12 12 0 .o5.o5/2.o  * 30  1 4  4 2 2  2 2 1 ++++ oo5oo5/2oo&#x  1 1  30 *  4 0 0  2 2 0 .. .x ..  0 2  * 60  1 1 1  1 1 1 ++++ .. ox ..&#x  1 2  2 1  60 * *  1 1 0 .o5.x ..  0 5  0 5  * 12 *  1 0 1 .. .x5/2.o  0 5  0 5  * * 12  0 1 1 ++++ oo5ox ..&#x ♦ 1 5  5 5  5 1 0  12 * * .. ox5/2oo&#x ♦ 1 5  5 5  5 0 1  * 12 * .o5.x5/2.o ♦ 0 30  0 60  0 12 12  * * 1
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