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IOU

a written acknowledgment of a debt, especially an informal one consisting only of the letters IOU, the sum owed, and the debtor's signature.

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Also, I.O.U.

Origin:
1610–20; representing I owe you

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Iou is always a great word to know.

So is quincunx. Does it mean:

an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.

the offspring of a zebra and a donkey.

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Collins

World English Dictionary

IOU

—n
	a written promise or reminder to pay a debt

[C17: representing I owe you]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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American Heritage

Cultural Dictionary

IOU definition

Abbreviation for “I owe you.” An IOU is a written statement of a borrower's obligation to pay a debt.

American Heritage

Abbreviations & Acronyms

IOU
a note of debt (from "I owe you")

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"Latin America is very fond of the word "hope." We like to be called the "continent of hope." Candidates for deputy, senator, president, call themselves "candidates of hope." This hope is really something like a promise of heaven, an IOU whose payment is always being put off. It is put off until the next legislative campaign, until next year, until the next century."

-Pablo Neruda

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