Acronym	ene
Name	enneazetton, 8D simplex (α8), pyrozetton, octaexal pyramid
Circumradius	2/3 = 0.666667
Inradius	1/12 = 0.083333
Dual	(selfdual, in different orientation)
Confer	general polytopal classes: simplex
External links

Incidence matrix according to Dynkin symbol

x3o3o3o3o3o3o3o

. . . . . . . . | 9 ♦  8 | 28 |  56 |  70 | 56 | 28 | 8
----------------+---+----+----+-----+-----+----+----+--
x . . . . . . . | 2 | 36 ♦  7 |  21 |  35 | 35 | 21 | 7
----------------+---+----+----+-----+-----+----+----+--
x3o . . . . . . | 3 |  3 | 84 ♦   6 |  15 | 20 | 15 | 6
----------------+---+----+----+-----+-----+----+----+--
x3o3o . . . . . ♦ 4 |  6 |  4 | 126 ♦   5 | 10 | 10 | 5
----------------+---+----+----+-----+-----+----+----+--
x3o3o3o . . . . ♦ 5 | 10 | 10 |   5 | 126 ♦  4 |  6 | 4
----------------+---+----+----+-----+-----+----+----+--
x3o3o3o3o . . . ♦ 6 | 15 | 20 |  15 |   6 | 84 |  3 | 3
----------------+---+----+----+-----+-----+----+----+--
x3o3o3o3o3o . . ♦ 7 | 21 | 35 |  35 |  21 |  7 | 36 | 2
----------------+---+----+----+-----+-----+----+----+--
x3o3o3o3o3o3o . ♦ 8 | 28 | 56 |  70 |  56 | 28 |  8 | 9