Acronym taope
Name triangle atop octahedral-prism
Circumradius sqrt(3)/2 = 0.866025
Lace city
in approx. ASCII-art
       o o3x  
              
              
              
x o3x    x x3o
Face vector 15, 51, 68, 41, 11
Confer
more general:
(N-gon, N-p, gyro N-p)-trigonic  
uniform relative:
dot  
related segmentotera:
teta ope  
general polytopal classes:
segmentotera   lace simplices  

This wedge of dot can be obtained from its tet-first half, tetaope, as a diminishing. In fact the cutting hyperplane rasps the top tet from one of its tips down to its opposite triangle, whereas at the opposite base it just scratches tangentially, that is, the ope there remains unchanged.

None the same it well can be extrapolated towards any general N-gonal symmetry other than just 3, then resulting in (N-gon, N-p, gyro N-p)-trigonic.


Incidence matrix according to Dynkin symbol

oxx oox3xxo&#x   → height(1,2) = sqrt(3)/2 = 0.866025
                   height(1,3) = sqrt(5/12) = 0.645497
                   height(2,3) = sqrt(2/3) = 0.816497

o.. o..3o..    | 3 * * | 2 2  4 0 0  0 0 0 | 1 1 4  4 2 2 4 0 0 0 0 0 0 0 | 2 2 2 2 4 1 2 2 0 0 0 0 0 | 1 1 2 2 1 0
.o. .o.3.o.    | * 6 * | 0 1  0 1 2  2 0 0 | 0 1 2  2 0 0 0 2 1 2 1 2 0 0 | 2 1 2 1 2 0 0 0 1 1 2 1 0 | 1 1 2 1 0 1
..o ..o3..o    | * * 6 | 0 0  2 0 0  2 1 2 | 0 0 0  2 2 2 1 0 0 2 2 1 2 1 | 0 0 2 2 1 2 1 1 0 2 1 1 1 | 0 2 1 1 1 1
---------------+-------+-------------------+------------------------------+---------------------------+------------
... ... x..    | 2 0 0 | 3 *  * * *  * * * | 1 0 2  0 0 0 2 0 0 0 0 0 0 0 | 1 2 0 0 2 0 1 2 0 0 0 0 0 | 1 0 1 2 1 0
oo. oo.3oo.&#x | 1 1 0 | * 6  * * *  * * * | 0 1 2  2 0 0 0 0 0 0 0 0 0 0 | 2 1 2 1 2 0 0 0 0 0 0 0 0 | 1 1 2 1 0 0
o.o o.o3o.o&#x | 1 0 1 | * * 12 * *  * * * | 0 0 0  1 1 1 1 0 0 0 0 0 0 0 | 0 0 1 1 1 1 1 1 0 0 0 0 0 | 0 1 1 1 1 0
.x. ... ...    | 0 2 0 | * *  * 3 *  * * * | 0 1 0  0 0 0 0 2 0 2 0 0 0 0 | 2 0 2 0 0 0 0 0 1 1 2 0 0 | 1 1 2 0 0 1
... ... .x.    | 0 2 0 | * *  * * 6  * * * | 0 0 1  0 0 0 0 1 1 0 0 1 0 0 | 1 1 0 0 1 0 0 0 1 0 1 1 0 | 1 0 1 1 0 1
.oo .oo3.oo&#x | 0 1 1 | * *  * * * 12 * * | 0 0 0  1 0 0 0 0 0 1 1 1 0 0 | 0 0 1 1 1 0 0 0 0 1 1 1 0 | 0 1 1 1 0 1
..x ... ...    | 0 0 2 | * *  * * *  * 3 * | 0 0 0  0 2 0 0 0 0 2 0 0 2 0 | 0 0 2 0 0 2 1 0 0 2 1 0 1 | 0 2 1 0 1 1
... ..x ...    | 0 0 2 | * *  * * *  * * 6 | 0 0 0  0 0 1 0 0 0 0 1 0 1 1 | 0 0 0 1 0 1 0 1 0 1 0 1 1 | 0 1 0 1 1 1
---------------+-------+-------------------+------------------------------+---------------------------+------------
... o..3x..    | 3 0 0 | 3 0  0 0 0  0 0 0 | 1 * *  * * * * * * * * * * * | 0 2 0 0 0 0 0 2 0 0 0 0 0 | 1 0 0 2 1 0
ox. ... ...&#x | 1 2 0 | 0 2  0 1 0  0 0 0 | * 3 *  * * * * * * * * * * * | 2 0 2 0 0 0 0 0 0 0 0 0 0 | 1 1 2 0 0 0
... ... xx.&#x | 2 2 0 | 1 2  0 0 1  0 0 0 | * * 6  * * * * * * * * * * * | 1 1 0 0 1 0 0 0 0 0 0 0 0 | 1 0 1 1 0 0
ooo ooo3ooo&#x | 1 1 1 | 0 1  1 0 0  1 0 0 | * * * 12 * * * * * * * * * * | 0 0 1 1 1 0 0 0 0 0 0 0 0 | 0 1 1 1 0 0
o.x ... ...&#x | 1 0 2 | 0 0  2 0 0  0 1 0 | * * *  * 6 * * * * * * * * * | 0 0 1 0 0 1 1 0 0 0 0 0 0 | 0 1 1 0 1 0
... o.x ...&#x | 1 0 2 | 0 0  2 0 0  0 0 1 | * * *  * * 6 * * * * * * * * | 0 0 0 1 0 1 0 1 0 0 0 0 0 | 0 1 0 1 1 0
... ... x.o&#x | 2 0 1 | 1 0  2 0 0  0 0 0 | * * *  * * * 6 * * * * * * * | 0 0 0 0 1 0 1 1 0 0 0 0 0 | 0 0 1 1 1 0
.x. ... .x.    | 0 4 0 | 0 0  0 2 2  0 0 0 | * * *  * * * * 3 * * * * * * | 1 0 0 0 0 0 0 0 1 0 1 0 0 | 1 0 1 0 0 1
... .o.3.x.    | 0 3 0 | 0 0  0 0 3  0 0 0 | * * *  * * * * * 2 * * * * * | 0 1 0 0 0 0 0 0 1 0 0 1 0 | 1 0 0 1 0 1
.xx ... ...&#x | 0 2 2 | 0 0  0 1 0  2 1 0 | * * *  * * * * * * 6 * * * * | 0 0 1 0 0 0 0 0 0 1 1 0 0 | 0 1 1 0 0 1
... .ox ...&#x | 0 1 2 | 0 0  0 0 0  2 0 1 | * * *  * * * * * * * 6 * * * | 0 0 0 1 0 0 0 0 0 1 0 1 0 | 0 1 0 1 0 1
... ... .xo&#x | 0 2 1 | 0 0  0 0 1  2 0 0 | * * *  * * * * * * * * 6 * * | 0 0 0 0 1 0 0 0 0 0 1 1 0 | 0 0 1 1 0 1
..x ..x ...    | 0 0 4 | 0 0  0 0 0  0 2 2 | * * *  * * * * * * * * * 3 * | 0 0 0 0 0 1 0 0 0 1 0 0 1 | 0 1 0 0 1 1
... ..x3..o    | 0 0 3 | 0 0  0 0 0  0 0 3 | * * *  * * * * * * * * * * 2 | 0 0 0 0 0 0 0 1 0 0 0 1 1 | 0 0 0 1 1 1
---------------+-------+-------------------+------------------------------+---------------------------+------------
ox. ... xx.&#x  2 4 0 | 1 4  0 2 2  0 0 0 | 0 2 2  0 0 0 0 1 0 0 0 0 0 0 | 3 * * * * * * * * * * * * | 1 0 1 0 0 0
... oo.3xx.&#x  3 3 0 | 3 3  0 0 3  0 0 0 | 1 0 3  0 0 0 0 0 1 0 0 0 0 0 | * 2 * * * * * * * * * * * | 1 0 0 1 0 0
oxx ... ...&#x  1 2 2 | 0 2  2 1 0  2 1 0 | 0 1 0  2 1 0 0 0 0 1 0 0 0 0 | * * 6 * * * * * * * * * * | 0 1 1 0 0 0
... oox ...&#x  1 1 2 | 0 1  2 0 0  2 0 1 | 0 0 0  2 0 1 0 0 0 0 1 0 0 0 | * * * 6 * * * * * * * * * | 0 1 0 1 0 0
... ... xxo&#x  2 2 1 | 1 2  2 0 1  2 0 0 | 0 0 1  2 0 0 1 0 0 0 0 1 0 0 | * * * * 6 * * * * * * * * | 0 0 1 1 0 0
o.x o.x ...&#x  1 0 4 | 0 0  4 0 0  0 2 2 | 0 0 0  0 2 2 0 0 0 0 0 0 1 0 | * * * * * 3 * * * * * * * | 0 1 0 0 1 0
o.x ... x.o&#x  2 0 2 | 1 0  4 0 0  0 1 0 | 0 0 0  0 2 0 2 0 0 0 0 0 0 0 | * * * * * * 3 * * * * * * | 0 0 1 0 1 0
... o.x3x.o&#x  3 0 3 | 3 0  6 0 0  0 0 3 | 1 0 0  0 0 3 3 0 0 0 0 0 0 1 | * * * * * * * 2 * * * * * | 0 0 0 1 1 0
.x. .o.3.x.     0 6 0 | 0 0  0 3 6  0 0 0 | 0 0 0  0 0 0 0 3 2 0 0 0 0 0 | * * * * * * * * 1 * * * * | 1 0 0 0 0 1
.xx .ox ...&#x  0 2 4 | 0 0  0 1 0  4 2 2 | 0 0 0  0 0 0 0 0 0 2 2 0 1 0 | * * * * * * * * * 3 * * * | 0 1 0 0 0 1
.xx ... .xo&#x  0 4 2 | 0 0  0 2 2  4 1 0 | 0 0 0  0 0 0 0 1 0 2 0 2 0 0 | * * * * * * * * * * 3 * * | 0 0 1 0 0 1
... .ox3.xo&#x  0 3 3 | 0 0  0 0 3  6 0 3 | 0 0 0  0 0 0 0 0 1 0 3 3 0 1 | * * * * * * * * * * * 2 * | 0 0 0 1 0 1
..x ..x3..o     0 0 6 | 0 0  0 0 0  0 3 6 | 0 0 0  0 0 0 0 0 0 0 0 0 3 2 | * * * * * * * * * * * * 1 | 0 0 0 0 1 1
---------------+-------+-------------------+------------------------------+---------------------------+------------
ox. oo.3xx.&#x  3 6 0 | 3 6  0 3 6  0 0 0 | 1 3 6  0 0 0 0 3 2 0 0 0 0 0 | 3 2 0 0 0 0 0 0 1 0 0 0 0 | 1 * * * * *
oxx oox ...&#x  1 2 4 | 0 2  4 1 0  4 2 2 | 0 1 0  4 2 2 0 0 0 2 2 0 1 0 | 0 0 2 2 0 1 0 0 0 1 0 0 0 | * 3 * * * *
oxx ... xxo&#x  2 4 2 | 1 4  4 2 2  4 1 0 | 0 2 2  4 2 0 2 1 0 2 0 2 0 0 | 1 0 2 0 2 0 1 0 0 0 1 0 0 | * * 3 * * *
... oox3xxo&#x  3 3 3 | 3 3  6 0 3  6 0 3 | 1 0 3  6 0 3 3 0 1 0 3 3 0 1 | 0 1 0 3 3 0 0 1 0 0 0 1 0 | * * * 2 * *
o.x o.x3x.o&#x  3 0 6 | 3 0 12 0 0  0 3 6 | 1 0 0  0 6 6 6 0 0 0 0 0 3 2 | 0 0 0 0 0 3 3 2 0 0 0 0 1 | * * * * 1 *
.xx .ox3.xo&#x  0 6 6 | 0 0  0 3 6 12 3 6 | 0 0 0  0 0 0 0 3 2 6 6 6 3 2 | 0 0 0 0 0 0 0 0 1 3 3 2 1 | * * * * * 1

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