What is the stone called with every written language carved on it?

There is no known stone with every written language carved on it. The idea is a fascinating one, but it's simply impossible due to the sheer number of written languages in the world (estimated to be over 7,000!).

Here's why:

* Space limitations: Even with a massive stone, fitting thousands of languages, each with their unique scripts and characters, would be impossible without making the writing so small it would be practically unreadable.

* Time and effort: Carving all these languages would be an unbelievably time-consuming and labour-intensive project.

* Practicality: What would be the purpose of such a stone? It wouldn't be practical for learning languages as the inscriptions would be too numerous and dense.

Instead of a single stone, there are some interesting attempts to showcase the diversity of writing systems:

* The Rosetta Stone: Though famous for deciphering hieroglyphs, it actually features three scripts: Ancient Egyptian hieroglyphs, Demotic script, and Greek.

* The Writing Museum in Berlin: This museum has a large collection of written languages from around the world, showcased through displays, artefacts, and interactive exhibits.

* Online resources: Websites and digital platforms like Omniglot offer comprehensive information and samples of various writing systems.

While a stone with every written language may remain a fictional concept, these resources allow us to explore and appreciate the rich tapestry of human communication through writing.