A quadrillion is the number that comes after a trillion. I had to look it up, because you don’t normally see numbers that go beyond a trillion.
The reason I looked it up is because of Rep. Mark Udall, who is apparently taxing the holy hell out of everyone in sight. At least, that’s what an online campaign ad from the National Senatorial Campaign Committee (NSCC) says. The ad, which appeared last week, appears to be the first advertisement targeted at the 2008 U.S. Senate race in Colorado