I once saw, on some FX web page, a horizontal colored meter that showed the major currencies–by themselves, not in pairs–from the weakest to the strongest, the strength being denoted by the color. The idea, of course, is to buy a strong currency and sell a weak one. I’ve lost the location of this meter. Does anyone know the URL or name of the web page (e.g., FXStreet)?
I’ve never seen what you’re referring to for single currencies. What you are describing, though, sounds very similar to the “Forex Momentum Index”, although this is for pairs. No comments here about the utility of that tool, but if you’re looking for it, you might try Googling the above phrase - it may be what you recall seeing.