Ohio Rev. Code Ann. § 3734.60
(A) As used in this section:
(B) On and after January 1, 1991, no person shall either manufacture or distribute for use in this state any new, unfilled plastic bottle or rigid plastic container unless it bears a label with the appropriate code as prescribed in this section that indicates the plastic resin used to produce the bottle or container. A plastic bottle or rigid plastic container having a label or basecup composed of material different from that comprising the rest of the bottle or container shall be labeled with the code for the basic material used in the bottle or container. The label required by this section shall consist of an equilateral triangle formed by three curved arrows of short radius with the apex of each point of the triangle at the midpoint of each arrow. The head of each arrow shall be at the midpoint of each side of the triangle with a short gap between the head of the arrow and the base of the succeeding arrow. The triangle formed by the three curved arrows shall depict a clockwise path around the code number, which shall be placed at the center of the triangle. The code letters shall be placed immediately below the triangle. The following code numbers and letters shall be used on the labels: