"Quadrillion" is a very large number that equals 1,000,000,000,000,000. It is a term used to describe an extremely big amount or quantity. Full definition
As of early 2014, tens of quadrillions of dollars have been stolen from innocent tenants to line the pockets of the perpetrators of this scam. (effectivecoverage.com)
The breakdown of energy sources in the United States (measured in quadrillion Btu), according to the Energy Information Administration. (discovermagazine.com)
This chart from EIA data shows the change in annual U.S. energy consumption by fuel source over the past decade, as measured in quadrillion Btu: (energytomorrow.org)