Acronym oca (old: oc)
Name octaexon,
7D simplex (α7),
pyroexon,
heptapetal pyramid
Circumradius sqrt(7)/4 = 0.661438
Inradius 1/sqrt(112) = 0.094491
Dual (seldual, in different orientation)
Confer
general polytopal classes:
simplex  
External
links 		wikipedia   mathworld

Incidence matrix according to Dynkin symbol

x3o3o3o3o3o3o

. . . . . . . | 8 ♦  7 | 21 | 35 | 35 | 21 | 7
--------------+---+----+----+----+----+----+--
x . . . . . . | 2 | 28 ♦  6 | 15 | 20 | 15 | 6
--------------+---+----+----+----+----+----+--
x3o . . . . . | 3 |  3 | 56 ♦  5 | 10 | 10 | 5
--------------+---+----+----+----+----+----+--
x3o3o . . . . ♦ 4 |  6 |  4 | 70 ♦  4 |  6 | 4
--------------+---+----+----+----+----+----+--
x3o3o3o . . . ♦ 5 | 10 | 10 |  5 | 56 |  3 | 3
--------------+---+----+----+----+----+----+--
x3o3o3o3o . . ♦ 6 | 15 | 20 | 15 |  6 | 28 | 2
--------------+---+----+----+----+----+----+--
x3o3o3o3o3o . ♦ 7 | 21 | 35 | 35 | 21 |  7 | 8

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