> This might be a bit confusing as written, because the slash "/" is normally used in roman numerals to indicate secondary chords.
Sorry, that's not something I'd seen. Edited the post to switch to "or".
> The terminology "open chords" is also a bit unusual. The term "open chords" usually refers to chords that use open strings (strings that are not fingered).
Looking some, you're totally right. I'm confused where I picked up the idea that these were called "open"? I think I've seen them written like "G<sub>open</sub>" to indicate that you don't play a 3rd? Calling them "power chords" in a non-rock context sounds off to me, though. Edited the post to call them chords without thirds.