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 See also ≅, a symbol used in approximation The eight trigrams of the Bagua: ☰, ☱, ☲, ☳, ☴, ☵, ☶, ☷ Ξ, capital letter Xi of the Greek alphabet 三, Chinese numeral for the number 3 Glossary of mathematical symbols Tesla Model 3, whose logo originally stylized the digit 3 as three horizontal bars III (disambiguation), three letter I's in a row