This indicator is only applicable to indexes, including Shanghai Composite Index, Shenzhen Composite Index, CSI 300 Index, GEM Index, and Small and Medium-sized Board Index. The BBD function is to compare the large buy order volume and large sell order volume of the constituent stocks in the index. The difference (net difference of large orders), as an indicator that measures the long and short strength of the main funds in the market, can be viewed on the K-line page and time-sharing page of the market index. For details, please see the indicator description in the upper right corner of the level2 client