The Hang Seng index, also known as the HSI, is the most widely used stock market benchmark in Hong Kong. However, there are several other synonymous terms for the Hang Seng index that are used interchangeably, including the Hong Kong Hang Seng Index, Hong Kong's stock market benchmark, HSI, and the Hang Seng. Regardless of which term is used, the Hang Seng index is an essential tool for investors aiming to monitor the performance of the Hong Kong stock market. The index is updated in real-time, making it an invaluable source of up-to-date information for anyone interested in understanding the behavior of the Hong Kong stock market.