Acronym ...
Name hyperbolic order ∞ horocyclic tiling
 
Vertex figure [∞]
Dual (selfdual)

Incidence matrix according to Dynkin symbol

x∞o∞o   (N,M→∞)

. . . | 2N |  M |  M
------+----+----+---
x . . |  2 | NM |  2
------+----+----+---
x∞o . |  M |  M | 2N

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