What is "jillions"

Usage examples of "jillions".

The penetrator sailed off into solar oblivion, adding its own miniscule trace of heavy elements to the untold jillions of tons already there.

Once you got away from all the jillions of people, Florida was just as wild as Montana.

Perfectly round rashand I mean computer-engineering-type perfect roundmade up of jillions of little bumps.