Historical documents: O Alfabeto Funcional Universal: χ, χ² e ψ como Variáveis Ocultas da Física Moderna

This article introduces, in a didactic and structured way, the triad (χ, χ², ψ) as the universal functional alphabet underlying modern physics. We demonstrate that these elements—coherence flux (χ), irreversible density (χ²), and adaptive opposition (ψ)—appear across fundamental theories such as Quantum Mechanics, Relativity, Thermodynamics, Cosmology, and Information Theory, albeit under different names. By making explicit this hidden grammar, the work complements the Universal Functional Coherence Theory (UFCT), providing a pedagogical bridge between its formal mathematical structure and the well-established frameworks of contemporary physics. This contribution should be viewed as an exploratory step, highlighting connections and patterns that are already present in diverse areas of physics but often remain implicit. Given the ambitious scope of the proposal, we remain fully open to critiques, suggestions, and collaborations from the scientific community.