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Google's name is derived from "googol", a mathematical term, which is equal to 1 followed by 100 zeroes.
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 = 1 googol
Source: Googol