Index linked bond
From ACT Wiki
A security paying a coupon that varies according to some underlying index (often called index linkers) - not a fixed, nominal coupon nor a coupon at a margin above a published reference rate.
The most common class of index linked bonds are inflation linked bonds paying a coupon linked to inflation so as to provide a real return.
For example UK Index Linked Gilts or US Treasury Inflation Protected Securities (TIPS).