Paper promise (3)
I believe the answer is:
iou
(Other definitions for iou that I've seen before include "Promise to pay in vowels" , "Admission of liability" , "Debtor's note" , "I owe you" , "Promissory note" .)
I believe the answer is:
iou
(Other definitions for iou that I've seen before include "Promise to pay in vowels" , "Admission of liability" , "Debtor's note" , "I owe you" , "Promissory note" .)