≡

The symbol ≡ (triple bar) is used in science and mathematics with several different meanings. It may refer to the following:

Mathematics

 * Identity (mathematics), identity of two mathematical expressions
 * Logical biconditional, in logic (if and only if)
 * Modular arithmetic, a ≡ b (mod m)
 * Equivalence relation, often denoted using a triple bar

Chemistry

 * Triple bond, a type of covalent bond between two atoms

Computing

 * Hamburger button, often used for drop-down menus
 * Symbol for the line feed character in ISO 2047