Tarski's hierarchy of metalanguages establishes that a coherent semantics requires object-language expressions to be named by distinct metalanguage terms, never by co-level expressions.

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Hierarchy of metalanguages(Tarski's main contribution): A system showing different levels of language, where each level can talk about the level below it—like how English can describe the rules of English, but you need a higher level of English to talk about *that* description.
Tarski: Alfred Tarski was a Polish-American logician and mathematician (1901-1983) who made groundbreaking discoveries about how language, logic, and truth work together. He's most famous for developing a mathematical theory of truth that explains how words and sentences relate to the real world—essentially answering the question "what does it mean for something to be true?" His ideas are fundamental to modern logic, computer science, and philosophy because they provided precise tools for understanding language and reasoning.
co-level expressions(what Tarski says should be avoided): Words or statements that exist at the same language level, rather than at different levels in a hierarchy.
metalanguage(Mathematics and philosophy of mathematics)

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