Bimonster
The wreathed product of the Monster Group by 
. The bimonster is a quotient of the Coxeter Groupwith the following Coxeter-Dynkin Diagram.
This had been conjectured by Conway, but was proven around 1990 by Ivanov and Norton. If the parameters 
in Coxeter's Notation 
are written side by side, the bimonster can be denoted by the BeastNumber 666.
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