TYO10 is the ticker symbol for the CBOE (Chicago Board Options Exchange) 10-Year Treasury Yield Index. This index is a measure of the yield on U.S. Treasury notes with a maturity of 10 years. It is based on the most recently settled 10-year Treasury futures contract traded on the Chicago Board of Trade (CBOT). The TYO10 is an important benchmark used by investors to track the performance of the U.S. Treasury market and to make decisions about investments in fixed-income securities.