IOU

IOU can refer to:

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• An IOU, a promise of money, goods, services, or other items of value, which may be either written or verbal. It is commonly held that the name derives from the phonetic pronunciations of the respective letters, which sound like the phrase "I owe you,". An IOU is less formal than a contract such as a promissory note, and, unless in the form of a written document stating that the value discussed will be repaid within a certain time, is generally not held to be legally binding (in addition to considerations such as the unenforceability of gambling debts in some nations).
• IOU, a cellular phone service provided by Vodafone New Zealand. If a customer sends the letters IOU by form of SMS (text messaging) to the number 464, he/she will get a NZ$2.00 top-up to their pay as you go credit, which is repaid when the "debtor" next tops up his/her phone.
• IOU, an investor-owned utility (energy) company.
• I, O, and U are also the three operators named sun (☉) http://www.symbols.com/encyclopedia/26/268.html, planet (⊕) http://www.symbols.com/encyclopedia/29/291.html, and moon (☾) http://www.symbols.com/encyclopedia/02/021.html respectively in the emin system.