Rig Chat with Mike Thompson (Withered) 

I might be getting my terminology wrong, but would it only be an inverted 5th in drop tuning?

That fingering in a drop tuning would be a 5 add 9 chord.

To me it depends, for example, on what the bass is doing. If the bass players the same note as the lowest string then it's a 4th chord plus octave. If the bass plays the same note as the middle string then it's a power chord with an octave of the 5th. Both are cool.

​@@MrRyanshredsOP is correct. It's 5th, Root, 5th in standard tuning. Same chord shape/fingering in drop tuning would be Root, 5th, 9th.