the.com/treasure map

means A chart—real or metaphorical—that claims to show the exact path to buried riches, more valuable for the hope it sells than the gold it delivers.

from "Treasure" traces back through Old French 'tresor' to Latin 'thesaurus' (a store or hoard) and ultimately Greek 'thēsauros'—the same root that gives us the word for a book of synonyms, both being places where valuable things are kept. "Map" comes from Latin 'mappa,' meaning cloth or napkin, since early charts were drawn on cloth. The 'treasure map' itself as a cultural object—parchment, dotted line, bold X—is largely a literary invention, cemented by pirate adventure stories in the 1800s rather than any real maritime practice; real pirates rarely buried treasure or drew maps to it.