Zillion

A generic word for a very Large Number. The term has no well-defined mathematical meaning. Conway and Guy (1996) define the $n$th zillion as $10^{3n+3}$ in the American system ( ${\rm million}=10^6$, ${\rm billion}=10^9$, ${\rm trillion}=10^{12}$, ...) and $10^{6n}$ in the British system ( ${\rm million}=10^6$, ${\rm billion}=10^{12}$, ${\rm trillion}=10^{18}$, ...). Conway and Guy (1996) also define the words n-plex and n-minex for $10^n$ and $10^{-n}$, respectively.

See also Large Number

References

Conway, J. H. and Guy, R. K. The Book of Numbers. New York: Springer-Verlag, pp. 13-16, 1996.