Mine is “palimpsest”. I first encountered this word while reading The Secret History by Donna Tartt.
Definition: a manuscript or piece of writing material on which the original writing has been effaced to make room for later writing but of which traces remain.
I love that there’s a word for this.
I just came across “palimpsest” for the first time recently too! It was while reading The Invisible Life of Addie LaRue, by VE Schwab. It’s been a while since I had to look a word up, so it stuck in my mind, lol.