Number of banknotes and coins of different value and their ratio that make up the The money used in a particular country at a particular time, like dollar, yen, euro, etc., consisting of banknotes and coins, that does not require endorsement as a medium of exchange. in circulation. A ratio of 1-2-5 among them is very common. 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. families are typically composed of between 4 and 8 denominations, their ratio and balance depending also from the value and number of coins in circulation.