| Acronym | shadow |
| Name |
small heptagrammic disphenoid, small heptagramm atop fully orthogonal small heptagramm |
| Circumradius | sqrt[1+1/(2 sin2(2 pi/7))]/2 = 0.674163 |
| Dual | (selfdual) |
| Face vector | 14, 63, 100, 63, 14 |
| Confer |
|
Incidence matrix according to Dynkin symbol
xo7/2oo ox7/2oo&#x → height = sqrt[1-1/(2 sin2(2pi/7))] = 0.426636
(pyramid product of 2 {7/2}s)
o.7/2o. o.7/2o. & | 14 | 2 7 | 1 21 | 8 14 | 9
---------------------+----+-------+------+-------+---
x. .. .. .. & | 2 | 14 * | 1 7 | 7 7 | 8
oo7/2oo oo7/2oo&#x | 2 | * 49 | 0 4 | 2 4 | 4
---------------------+----+-------+------+-------+---
x.7/2o. .. .. & | 7 | 7 0 | 2 * | 7 0 | 7 {7/2}
xo .. .. ..&#x & | 3 | 1 2 | * 98 | 1 2 | 3
---------------------+----+-------+------+-------+---
xo7/2oo .. ..&#x & ♦ 8 | 7 7 | 1 7 | 14 * | 2
xo .. ox ..&#x ♦ 4 | 2 4 | 0 4 | * 49 | 2
---------------------+----+-------+------+-------+---
xo7/2oo ox ..&#x & ♦ 9 | 8 14 | 1 21 | 2 7 | 14
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