ELI5: Explain Like I'm 5

Bit-reversal permutation

Bit-reversal permutation is like rearranging pieces of a puzzle. Imagine that you have a bunch of puzzle pieces that have either a 0 or 1 on them. You have to rearrange them so they are in the opposite order. For example, if you have the pieces 111011, you would have to rearrange them to be 110111. This is like a bit-reversal permutation.