The range of SI unit prefixes is shown above; "yotta" is the largest accepted prefix, used to measure things like the diameter of the known universe (in yards).
U.S. District Judge Denny Chin, who heard the case in Manhattan's federal court, presided over the Bernie Madoff trial, and thus is familiar with large amounts of money - but even he was impressed by the size of Mr. Chiscolm's claim. If every person on earth had as much money as Bill Gates, that total wealth would still only be 1/1000th of the amount requested.
The plaintiff was asked to provide further evidence to support his claim.
Link. Table from Wikipedia.