1, one is the Dow Jones Industrial Average, which is the oldest stock market index in the world. The Dow Jones Industrial Average is calculated by weighting the stock price, which is a price-weighted index. The prices of constituent stocks are first added up and then divided by a divisor.

2. One is the Nasdaq Composite Index. Nasdaq index is a market value weight index, and its constituent stocks cover all the stocks listed on Nasdaq in the United States, which is an important indicator of global technology stocks.

3. One is the Standard & Poor's 500 Index, which covers the 500 companies with the highest market value listed on the US stock market. These companies must be listed on the new york Stock Exchange or Nasdaq.