Treasury index is a type of benchmark index that tracks the performance of U.S. Treasury securities. It is typically used as a benchmark for other types of debt securities, such as mortgages and corporate bonds. The most widely used Treasury index is the yield on the 10-year Treasury note, which is considered to be a benchmark for long-term interest rates. Treasury indexes can also refer to a basket of Treasury securities of different maturities and types. The most common Treasury indexes are the CBOE Interest Rate 10-Year Treasury Note Index (TNX) and the Bloomberg Barclays US Treasury Bond Index.