Another related issue for me. When I write C5, BB understands and displays that. The problem is that there is no change in sound from C and C5, at least on the styles I have tried.

Beyond BIAB, there seems to be disagreement about whether a "power chord" could actually be considered a chord. I have seen it referred to as a "fifth chord", also as a dyad.

Given the significant effect on intermodulation distortion when the third is removed, I am surprised there is no standard name for it.

Cheers,

Billy