MARKERS are financial instruments used to record debt or credit. DEBTS is a five-letter term for money owed by one person to another. CHITS is another five-letter term for an informal document acknowledging a debt. IOUS is a four-letter term for a written promise to pay a debt. TAGS is a four-letter term for a label or ticket attached to an item. PROMISSORYNOTES is a fifteen-letter term for a written and signed promise to pay a specified amount of money on demand or at a certain time.