If it is futures, there should be a number less than or equal to 8 (such as -6) behind it, indicating that eight orders are successfully paired and six lots are lightened;

Empty, in which "empty" means the dominant selling direction, that is, the price of these eight lots was traded at the buying price among the three prices at that time, that is, the off-site seller voluntarily traded at a price lower than that of the seller who had placed an order among the three quotations, and the word "open" means that these eight lots have both opened and closed positions. Similarly, according to "time priority", the buyer of passive trading also opened and closed positions, which is of course omitted.

Others can be analogized, such as more opening, more leveling, more air exchange and air exchange.