RSX, or the Russian Stock Index, is a stock market index that tracks the performance of the largest and most liquid companies listed on the Moscow Exchange. It serves as a benchmark for investors to gauge the overall health of the Russian economy and its stock market. The RSX includes major sectors such as energy, finance, and telecommunications, reflecting the diverse nature of the Russian economy. Investors often use the RSX to make informed decisions about investing in Russian equities, as it provides insights into market trends and company performance.