IOU

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IOU

a corrupted abbreviated form of the words ‘I owe you’. It is a written acknowledgement of a debt. It is not a negotiable instrument, like a cheque, but maybe founded upon in court to make recovery of the sum more simple.
Collins Dictionary of Law © W.J. Stewart, 2006
References in periodicals archive ?
Love is such a precious gift, One thing in my life I know is true, And I.O.U.
Farooque,32, followed her in and she wrote him the I.O.U.
THE sister of a British movie star was raped by a cab driver after writing him a pounds 20 I.O.U. following a boozy night out, a court heard yesterday.