≡

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

• Definition: Identity of a variable and a mathematical expression because of the definition of the variable
• Logical biconditional, in logic (if and only if)
• Modular arithmetic, a ≡ b (mod m)
• General equivalence relation, often denoted using a triple bar

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

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

• ≅, a symbol sometimes used to show an approximate value,

≅ is also used to show geometric congruence

• The eight 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 Is in a row