subsidiary coin; subsidiary money
Economic term for coins or currency with limited legal tender status, used for small payments.
Subsidiary coins may not be usable for payments above a certain amount.
本位貨幣 is standard money with full legal tender status, while 補助貨幣 is subsidiary money with limited legal tender.
Compound of 補助 (assistance, support) and 貨幣 (currency, money). The term is a direct translation of the English 'subsidiary money'.