Related Clues:

• Debtor's onus
• Poker pot paper, perhaps
• Promise of repayment
• Indebtedness initials
• Gambler's debt, so to speak
• Letters on a note
• Promise of a sort
• Letters on a chit
• It might be called in
• Paper in a pot, maybe
• Letters denoting debt
• Promise to repay
• Informal debt instrument
• Short notice?
• Receipt