Money M usually refers to the money supply and refers to the total amount of money in a country or region. Generally speaking, money supply includes cash in circulation, bank demand deposits, time deposits, other monetary instruments that can be used for circulation and various forms of quasi-money. In monetary policy, money supply is a very important indicator, which directly affects the level of inflation and economic operation.

M of money can also represent the unit of money quantity. As a prefix of numbers, m is often used to measure monetary units. For example, 1m is equal to 1 000,000, then 1m is 1 000,000. It is very common in financial transactions. For example, the market value of a company is 1 billion dollars, which is 1 000m million dollars.

In addition, m can also represent the form of money. In the era of metal currency circulation, m usually represents the material and weight of metal. For example, the unit of gold is ounces or grams, and its monetary value depends on its purity and weight. Generally speaking, the higher the fineness and weight, the higher the monetary value. On some coins, M may be engraved on its surface to show its value.