Zillion

Although the term is primarily used to indicate an indefinitely large number, Conway and Guy define n-zillion as $$10^{3n+3}$$ for the English speakers and $$10^{6n}$$ for the French and German speakers. In cooperation with Allan Wechsler, Conway and Guy extended the system to xilliyillizilion $$= (10^6x+10^3y+z)$$-zillion, using "n" for x, y, or z lest any of them be zero. For example, a quadrillitrillinillion is $$10^{3\left(10^6\cdot 4+10^3\cdot 3+0\right)+3}$$.