A common way to sign "Rolls-Royce" in ASL is to fingerspell "RR" using a palm forward, upright "R" hand using a very small, very light forward thrust to show the first "R" and then slide (with perhaps a very small arc back) the hand slightly to the dominant side and show the second "R" right next to where the first "R" was shown (again, with a very small forward movement).
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Notes:
Notes: