A-shares include both the Shanghai Stock Exchange and the Shenzhen Stock Exchange, and are not limited to a single exchange.
A shares, i.e. RMB ordinary shares, are ordinary shares issued by the Company in China and traded in RMB**. It covers all A-shares** traded on the Shanghai ** Stock Exchange (SSE) and the Shenzhen ** Stock Exchange (SZSE). Therefore, when people refer to "A-shares", they usually refer to all A-shares** traded on the two major exchanges in Shanghai and Shenzhen, rather than specifically referring to one of the SSE or SZSE. Specifically:
SSE A-shares: refers to A-shares traded on the Shanghai Stock Exchange. The Shanghai Composite Index (SSI) reflects the overall changes in the listings on the Shanghai Stock Exchange, and its sample stocks include all listed shares, i.e. A shares and B shares.
SZSE A-shares: refers to A-shares traded on the Shenzhen Stock Exchange. The SZSE Component Index reflects the changes in the Shenzhen Stock Exchange.
In general, the A** market is an important part of China's **, which includes not only the A-shares of the Shanghai Stock Exchange and the Shenzhen Stock Exchange, but also some other sectors such as the Science and Technology Innovation Board and the ChiNext Board. When discussing **, it is usually decided based on the specific context whether we are talking about SSE or SZSE, or the entire A** field.