U+225C "≜" Delta Equal To Unicode Character

U+225C "≜" Delta Equal To is a mathematical symbol that represents a relationship of equality where a specific change or difference, often denoted by the Greek letter delta, is involved. It is commonly used in mathematics and physics to indicate that two expressions are equivalent by definition or that one quantity is defined to be equal to another, particularly in contexts involving calculus, thermodynamics, or differential equations. The symbol is formed by combining a small delta triangle with an equals sign, visually reinforcing the idea of equality under a specified variation.