In reply to Talking about glyphs:
IMO including a "trailing bracket" is good in situations where you want to pluralize, e.g. "Which of these /R/s is working best?"
I get what you mean, but that could still be confused as R/s (arr slash ess, arr or ess) rather than R's. Or maybe we need to what Hrant said: which one of the Aarghs is working best?
Ultimately I think any solution has the potential to be confused or misunderstood. That's why I'd like to remove declaration or bracketing and use wording to mark with. Is "I love the R." confusing at all? Especially when prefixed with "uppercase" or "lowercase", it's not really ambiguous. Even if we came up with a great declaration system, bad writing still makes it a fail.