1 and a50 generally refer to the FTSE a50 index, which is a trading index launched by Xinhua FTSE Index Co., Ltd. to satisfy investors in China and qualified foreign institutional investors. Among them, FTSE China A50 Index includes 50 companies with the largest market value in China A-share market.

2.A50 Stock Index Futures Stock index futures with A50 index as the target can also be traded at night, so it can predict the market trend of A shares the next day.