Googolduplex

Googolduplex is a number equal to \(10^{10^{10^{100}}}\), or 1 followed by a googolplex zeroes. In Hyper-E notation, it is equal to E100#3.

The number has many alternative names such as googolplexplex, googolplusplex , gargoogolplex , googolduplex , googolplex2 , and googolplexian.

Ten to the power of googolduplex, \(10^{10^{10^{10^{100}}}}\), is called googoltriplex.

Etymology
After backforming the "-plex" suffix from "googolplex," the term "googolplexplex" follows naturally as double application of the suffix to googol. Googologists shortened this to "duplex," from the Greek prefix for "two," indicating that the "plex" suffix should be applied twice. "Googolplusplex," "gargoogolplex," and "googolplexian" do not appear to be of any logical etymology, other than being various mutations of googolplex.