Numbering enables a A banknote (or ‘bill’ as it is often referred to in the US) is a type of negotiable promissory note, issued by a bank or other licensed authority, payable to the bearer on demand. to be differentiated from another of the same Each individual value in a series of banknotes or coins.. If two banknotes have the same numbering it is a proof that one of them is false. Numbering is usually on both sides of the banknote, back and Facade, face. See Obverse..