Duality rule refers to a concept in mathematics and physics, where one can describe a physical or mathematical problem in terms of two seemingly different variables. Synonyms for the term duality rule could include duality principle, duality symmetry, and duality transformation. Other related synonyms could be dualism, dichotomy, complementarity, or double-sidedness. These terms all refer to the idea of two seemingly contrasting or opposing concepts that can exist together, often complementing or balancing each other out. The duality rule is a fundamental concept in various fields of science, including quantum mechanics, thermodynamics, and computer science.