The Poneglyphs are indestructible stone tablets scattered across the world, each inscribed with text in an ancient language that predates all modern writing systems. They were created during the Void Century by a civilization whose very existence the World Government has attempted to erase.

There are four types of Poneglyphs. The Historical Poneglyphs record events of the Void Century. The Instructional Poneglyphs provide guidance on finding other tablets. The Road Poneglyphs — of which there are exactly four — reveal the location of Laugh Tale when their information is combined. And the Rio Poneglyph, formed by connecting the Historical Poneglyphs, tells the true history of the world.

The script itself is logographic — each symbol represents a concept rather than a sound. The grammar follows a subject-object-verb order, with temporal markers embedded within the verb forms. What makes the language particularly challenging is its contextual layering: a single glyph can carry different meanings depending on the surrounding symbols and the physical location of the Poneglyph itself.

To read a Poneglyph, one must understand not just the symbols but the civilization that created them. The Great Kingdom's writing system was designed for permanence and precision. Every line, every curve serves a purpose. There is no ornamentation — only meaning compressed into stone.