Ohio Rev. Code Ann. § 4723.03
(B) No person shall knowingly do any of the following without holding a current, valid license to practice nursing as an advanced practice registered nurse issued under this chapter:
(E) No person shall use the titles or initials "graduate nurse," "G.N.," "professional nurse," "P.N.," "graduate practical nurse," "G.P.N.," "practical nurse," "P.N.," "trained nurse," "T.N.," or any other statement, title, or initials that would imply or represent to the public that the person is authorized to practice nursing in this state, except as follows: