R.I. Gen. Laws § 5-34-38: Right to use certified registered nurse practitioner title.

Any person who holds a license to practice as a certified registered nurse practitioner in this state has the right to use the title certified registered nurse practitioner and use the abbreviation “R.N.P..” No other person may assume that title or use that abbreviation or any other words or letters, signs, figures, or devices to indicate that the person using it is a certified registered nurse practitioner.