The invention relates to the field of deformed sheet materials, in particular of metal, plastic, glass, cardboard, paper, wood, laminated material and composite material, and articles manufactured with the use thereof. The sheet material is made such that the boundary of its transverse cross section and the boundary of its longitudinal cross section, in at least one of the sections, are made in the form of elements, differing in length, of different hyperbolas and/or ellipses with different values of eccentricities and focal parameters, and additional contain a section made in the form of elements, differing in length, of different hyperbolas and/or ellipses with different values of eccentricities and focal parameters, wherein the above-mentioned section of the boundary of the transverse section and the section of the boundary of the longitudinal cross section intersect. The technical result of the invention is the possibility of improving the reliability of identification and protection against counterfeiting of sheet materials in combination with convenience of identification due to simplifying the design of the working surface of tools.