An item which is rigid or semirigid, generally flat and smooth. Its thickness is small in comparison to its length and width. It has data thereon indicating method of operation, maintenance, and/or personnel protection. See also marker, identification; plate, identification; plate, designation; plate set, instruction; decal; and label. For items having the combination function of a plate, instruction and plate, identification, see plate, identification. Excludes tag, instruction.