Municipal Inflation-Linked Securities
Investment vehicles issued by various levels of governments containing variable coupon payments that increase and decrease with changes in the consumer price index (CPI).
Investopedia Commentary
This type of debt security is similar to regular municipal bonds, but municipal inflation-linked securities offer investors a slightly lower coupon rate because these securities are safer than debt instruments that expose the holder to inflation risk. Also, because these securities carry reduced inflation risk, they don't - like other debt securities - have the potential to increase in price should the rate of inflation subside.
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See also: Consumer Price Index - CPI, Coupon, Inflation-Indexed Security, Inflation-Protected Security, Inflationary Psychology, Inflationary Risk, TIPS