Series HH Bond Definition
A Series HH bond is a piece of paper that shows you've agreed to lend money to the U.S. Government. The government agrees to pay you back with extra money (interest) every six months by putting the money in your bank account for you. If you decide you want to buy a Series HH bond, you have to turn in a Series EE or Series E bond and then you can get a Series HH bond in its place (in exchange).