Googolplex

Googolplex is a large number equal to  (i.e., 1 with a googol number of 0s written after it).

The term was coined in 1938 after 9-year-old Milton Sirotta, nephew of Edward Kasner, coined the term "googol" and Kasner extended it to this larger number (Kasner 1989, pp. 20-27; Bialik 2004).

REFERENCES:

Bialik, C. "Searching for the Birth of the Googol." The Wall Street J. Jun. 19, 2004. https://afr.com/articles/2004/06/18/1087245103935.html.

Kasner, E. and Newman, J. R. Mathematics and the Imagination. Redmond, WA: Tempus Books, pp. 23-27, 1989.

Pappas, T. "Googol & Googolplex." The Joy of Mathematics. San Carlos, CA: Wide World Publ./Tetra, p. 76, 1989.