Ohio Rev. Code Ann. § 4733.021
(A) Except for an individual who, as part of the internal classification system of the individual's employer, uses the title "engineer" by itself or in conjunction with another term described in division (B) of this section and who does not represent the individual's self to the public or otherwise advertise the individual's self as an engineer, no individual shall, in connection with the individual's name, assume, use, or advertise: