burin

kaiverrin A chisel with a sharp point, used for engraving; a graver.
2006, (w), w:The Royal Game|Chess, translated by (w), London: Penguin,

I kept staring at the same wallpaper on the same wall; I stared at it so often that every line of its zigzag pattern has etched itself on the innermost folds of my brain as if with an engraver’s burin.