Touring is always important to me. It's like a big IOU to my fans, because I know they are the reason I exist. Katy Perry
A U.S. dollar is an IOU from the Federal Reserve Bank. It's a promissory note that doesn't actually promise anything. It's not backed by gold or silver. P. J. O'Rourke
And Ruby could well have been paying off an IOU the day he was used to kill Lee Harvey Oswald. Source: Internet
Legislators who logroll within a small body, for example, the U.S. House or Senate, have incentive to honor their IOU votes because they cannot have their reputations tainted if they wish to be effective politicians (Holcombe 2006 ). Source: Internet
Hundis are used as a form of remittance instrument to transfer money from place to place, as a form of credit instrument or IOU to borrow money and as a bill of exchange in trade transactions. Source: Internet
It is the ultimate political IOU, and it can be cashed in again and again. Source: Internet