“Squillion” is a made-up word to describe a very large number … but so is “googol”. Milton Sirotta was the 9 year old nephew of US mathematician Edward Kasner. Kasner needed a word for 10 to the 100th in decimal notation. That’s a 1 followed by one hundred 0s, or 10,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000. So Milton suggested “googol” and it stuck. When Google created their company, they thought they were naming it after the mathematical term but they misspelt it.
A google is so large that it is larger than all the atoms in the universe.