The term 'marked permanently' can be described by the crossword solution 'etched'. To etch something means to carve or engrave a design, pattern, or text into a hard surface. This is usually done with a sharp tool, such as a chisel, and is often used to create decorative designs on metal or glass. Etching is also used to make permanent marks on items that are meant to last for a long time, such as jewelry or artwork.