12 for 1, Names in All Positions
We should already have the naming for string 6, but let’s double check. We’ve chosen the tone names for the sharps/flats which correspond to the Major chords [when we modify this form to a minor, some of the root names change].
Once we get into a shape, it can be shifted to every position. 12 things, for knowing 1 thing, is good mileage. And, 3, 4, & 5 string versions are available; some fretted with individual fingers.
Sometimes this full version [6 string version] can be called a power chord, whether fully fingered as shown, or fretting just the bottom tones [the 6 and 5 strings – and the 4 string can be added as well]. Yet, the term power chord has come to mean just the R5 types, in common usage.