How about combining the ideas of http://i.imgur.com/PuGTE.png http://nxg.me.uk/temp/lambda-r.png (the one in the upper right) and http://tmp.barzilay.org/cr.png (forgetting about an explicit parenthesis) into a single, simple, new symbol like the one attached? (okay, it looks more like a lambda merged with a P rather than with an R but I think the trick would "just" be to find a font where lambdas and italic Rs combine more nicely than in my quick example).
For some reason it slightly reminds me of a symbol for some religious cult or political party, which might or might not be a good thing. And that's all I'll say on the topic... Goodnight. Philippe
<<attachment: lamket.jpg>>
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