Top and bottom edge of the head
<img src="https://eng-calculations.com/SVG/ISO/ISO_12474/Top and bottom edge of the head.svg" alt="Top_and_bottom_edge_of_the_head" title="Top_and_bottom_edge_of_the_head">
https://eng-calculations.com/SVG/ISO/ISO_12474/Top and bottom edge of the head.svg