Googolplex
A googol is larger than the range of elementary particles in the world, which amount to just 10 to the 80th power.
The term was devised by Milton Sirotta, the 9-year nephew of mathematician Edward Kasner, who'd requested his nephew what he thought such a massive number should be called. This type of number, Milton apparently replied after a brief thought, could just be called something as absurd as a"googol.