Seat refers to the terminal or computer remote communication port provided by the stock exchange (or futures exchange) in the trading hall for members and special members such as securities dealers (or futures dealers) to conduct quotation trading. The former is called tangible seats, and the latter is called intangible seats.
Seat number means that all brokers are members of the stock exchange, and each member has a seat number. Just like we have a securities account in Shanghai and Shenzhen stock markets. (Provide stock panning)