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

Look up ≡ in Wiktionary, the free dictionary.

• 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

• 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 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 Is in a row

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