What is the type of money is declared legal tender by government order referred to as?

The type of money declared legal tender by government order is referred to as "Fiat money." Fiat money has no intrinsic value and is not backed by a physical commodity like gold or silver; instead, its value is derived from the trust and confidence that people have in the issuing government. Examples include banknotes and coins that are officially recognized for settling debts and transactions.