A bank note is a type of currency issued by a bank or other financial institution. The term 'bank note' can refer to three different types of notes: a LIEN, ONE, and a tenner. A LIEN is a legal claim against a property that allows the holder to collect money owed to them from the sale of the property. ONE is a single unit of currency, such as a dollar or euro. A tenner is a slang term for a ten-dollar bill.