First of all, let's understand the meaning of changing hands. Changing hands refers to the transfer of orders in the same direction. For example, if the original bill in my hand is to be leveled, I must have sold it. Someone else must have bought it at this time. If he has opened a position, the market position has not changed at this time, but the list has been changed from my hand to his. This is called changing hands more, changing hands empty.

If the bulls open short positions at the same time, they are called double positions.

Long positions include the two situations mentioned above, which may be multi-changing hands or double positions. This term is viewed from the direction of the active party of the contract. For example, the selling price is 2 and the buying price is 1. If the transaction is 2 and it is an open position, it is called a long position, and vice versa. Bulls and bears are the same. Strictly speaking, this term is not standardized.

Double change hands, it is easier to understand, and the purchase and sale orders are transferred at the same time.

Among the above names, the most standard is to change hands \ empty hands \ double positions \ double positions.