Acronym ...
Name hyperbolic order 7 truncated trigonal tiling
 
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Circumradius sqrt[(3-cos2(π/7))/(3-4 cos2(π/7))] = 2.976586 i
Vertex figure [7,62]
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Incidence matrix according to Dynkin symbol

x3x7o   (N → ∞)

. . . | 42N |   1   2 |   2  1
------+-----+---------+-------
x . . |   2 | 21N   * |   2  0
. x . |   2 |   * 42N |   1  1
------+-----+---------+-------
x3x . |   6 |   3   3 | 14N  *
. x7o |   7 |   0   7 |   * 6N

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