Proper noun
Number of the Beast
(Christianity) The number 666, esoterically regarded as being related to the Beast.
And the multiverse concept first explored in Elsewhen gets very full treatment in Heinlein's last, World as Myth novels, particularly The Number of the Beast (1980), The Cat Who Walks Through Walls (1985) and To Sail Beyond the Sunset (1987). Source: Internet
Background The Cat Who Walks Through Walls may be regarded as part of Heinlein's multiverse series, or as a sequel to both The Number of the Beast : 145 and The Moon Is a Harsh Mistress. Source: Internet
But describing The Number of the Beast thus is like saying Moby Dick is about a one-legged guy trying to catch a fish". Source: Internet
Later work, 1980–1987 After a seven-year hiatus brought on by poor health, Heinlein produced five new novels in the period from 1980 ( The Number of the Beast ) to 1987 ( To Sail Beyond the Sunset ). Source: Internet
The legend is based on the fact that the sum of all the numbers on the roulette wheel (from 0 to 36) is 666, which is the " Number of the Beast ". Source: Internet