Damn... I'm sure I put a second half to that sentence. Oh well, here's the second half that isn't there:
Perhaps, to make the symbol they're playing around with more distinct from the symbol for a registered trademark, they could use a lowe case r? (Though I'm not sure that meets with the logic of the symbol they've devised, in which I guess the outer circle is meant to be an 'O' so that the whole thing represents the initials RO).