O que é Bermudan swaption?

A Bermudan swaption gives the right, on any one of a set of exercise dates $T_{e_1}<\dots<T_{e_m}$, to enter the swap that starts on that date and ends on a fixed final date $T_n$, at a fixed rate $K$. A “ten-non-call-one” receiver Bermudan can be exercised every year from year one into a receiver swap ending at year ten. It is a Bermudan exercise right in the sense of One Quant Book 5, chapter 6, applied to swaps.