Googol
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A googol is the number 10 raised to the 100th power, or <math>10^{100}</math>. To give an idea of the size of this number, it is greater than the estimate of the total number of molecules in the universe.
A googolplex is the number 10 raised to the googolth power, or <math>10^{10^{100}}</math>.
Neither of these numbers have any praticle application and are just given as an example expontial and numberplexes.
The name comes from American mathematician Edward Kasner's nephew Milton Sirotta.
The search engine Google's name is derived from googol.