Related Clues:

• Bills from tills
• There are two in eleven
• Change for $5
• Vending machine bills
• Tip jar fillers, mostly
• Some vending machine inserts
• Bills not found in ATMs
• It may hold your horses
• Possible binary digits
• Change machine inserts
• Aces, at times
• Georges
• Column in an addition problem
• Rightmost column, perhaps
• Uno, un, eins, etc.