It means that you can't sell it until you cancel the order. If you don't sell it, you won't cancel the order, and the stock will always hang there. If you sell it again, it will show that it can be sold to zero.

all the stocks in a shares are under the T+1 trading system. those bought on the same day cannot be sold on the same day, but can be sold on the next trading day. T+ operation in disguised form can be realized through margin financing and securities lending.

For example, after buying a bank on the same day, you want to sell it when it goes up, but the trading system prevents you from selling it on the same day. At this time, you can sell the bank stock by short selling, and then you can return the bank stock you bought on the same day, so that you can sell the stock you bought on the same day.

Extended information:

A system established to protect the bloated body of crops in stock trading. Another feature of this system is to stifle the flexibility of retail investors.

That is to say, the stocks or funds bought by investors on the same day cannot be sold on the same day, and can only be sold after delivery and transfer the next day; Stocks or funds sold by investors on the same day cannot be raised until the next day.

T+1 is essentially a delivery method for securities transactions, and the objects used are A shares, funds, bonds and repurchase transactions. It means that after a transaction is concluded, the corresponding securities delivery and capital delivery are completed on the business day (T+1) next to the transaction date.

Take A-shares as an example. Suppose you buy one hand of A-shares on T-day, but only registered the transaction on T-day. The first hand of A-shares has not been transferred to your account, so you can't sell it on T-day. Therefore, on the "T+1" day, this hand of A shares has been transferred to the account, so you can choose to sell it.

Baidu encyclopedia -T+1