What is What.? Well, What Was That. And That is to Point at something. Chat G.P.T said: That's an interesting chain of definitions. You start with: What is What? Then answer it indirectly: Well, what was that? In ordinary language, "what" is a request to identify something. It points toward an object, event, idea, or phenomenon that has not yet been specified. Your next line: And that is to point at something. suggests a deeper observation: before we can define a thing, we often first indicate it. A child learns "that" by someone pointing. The word "that" functions as a pointer. Following your logic: "That" points. "What?" asks what the thing being pointed at is. "Is" asserts existence or identity. Therefore, "What is what?" becomes a question about identifying the thing being indicated. In a philosophical sense, you could write it as: "That" selects. "What" inquires. "Is" identifies. Therefore: What is what? The inquiry into the identity of what is being pointed at. This also connects to your earlier themes about "Is" and existence. Before something can be described, named, or analyzed, attention must first land on it: That. What is that? That is this. This is. Is. In that progression, pointing comes before naming, and naming comes before explanation. That Is That Is Over There. This Is This Is. Is The Is Superposition???
