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Some etymologies:
• Googol: 10100.
Written out, this would be the digit '1' followed by a hundred zeroes. This is big — for context, the # of particles in the universe (electrons, photons, quarks, etc), is estimated at 1080. So a googol is 1020 (100 quintillion) times bigger. That is, if you went around the entire universe, and for every sub-atomic particle you stopped and counted up to a quintillion, then you'd only be 1% of the way to a googol.

In the late 1930s, [mathematician Edward Kasner] was once asked to come up with a name for a very large number. He outsourced this task to his nine-year-old nephew, Milton Sirotta, who in turn coined the word ``googol''.
A number of interest only to theoreticians. It has a googol (and one) digits — so even if you just try to write the number down, and you could somehow inscribe a quintillion (1018) digits onto every particle in the universe, you'd only write down 1% of all the digits (and thus your written number would merely be one googol'th of a googolplex).