What is ≜?

Written by Editorial Team | Last Updated: August 2026

The symbol ≜ (frequently rendered in standard text as the triangle-with-equals sign) is a specialized mathematical and logical notation primarily used to mean "is defined as" or "equals by definition." Unlike a standard equality sign (=) which denotes a value equivalence or a conditional equation that must be solved, ≜ establishes an explicit definition or assignment for a new variable, term, or mathematical expression within formal proofs, physics formulas, and engineering specifications.

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