Based on the legal functions of money in the judicial and banking system of the country, the present research deals with the practical analysis of what and nature of money. This research expresses this approach that the nature of money is not separate from its functions and the broad legal nature of money can be identified from its multiple functions. Contrary to the dominant approach that focuses on the nature and function of money, it should be acknowledged that this legal and economic phenomenon has multiple natures and functions that affect the limits of the monetary commitment. Today, these functions are emerging both in the judicial system and in the banking system of Iran, including banking transactions and banking operations, especially that the execution of court orders in the field of contractual or non-contractual monetary obligations is realized through the banking system. The current research with a descriptive-analytical method is an explanation of a comprehensive theory under the title of  multifaceted nature of money. In short, it should be said that considering the three major and main functions of money, i.e. a tool for payment, a tool for clearing and settlement of monetary obligations, as well as a tool for compensation for damages caused by the decrease in its value and the multiple legal functions of money in the judicial and banking systems, adopting the unit nature approach is not acceptable for money.