Treasury Inflation-Indexed Securities (TIIS) 

Securities designed to protect investors and the future value of their fixed-income investments from the adverse effects of inflation. Using the Consumer Price Index as a guide, the value of the securities' principal is adjusted to reflect the effects of inflation. Also known as Treasury Inflation Protected Securities (TIPS).

Remarks: Bond funds including mutual funds (open-end and closed-end, actively managed and indexed), exchange-traded funds and unit investment trusts offer a convenient and affordable way to invest in a diversified portfolio of bonds, but a bond fund investment can differ from a bond investment in ways that are important to understand.