≡

≡ may refer to:

Mathematics

The symbol ≡ (triple bar) is used in mathematics with several different meanings:

Identity (mathematics), identity of two mathematical expressions
Logical biconditional, in logic (if and only if)

Chemistry

Triple bond, a type of covalent bond between two atoms, in skeletal formula.

See also

≅, the symbol for a congruence relation in algebra
☰, Qián, the trigram of the I Ching that consists of three unbroken lines
Ξ, capital letter Xi of the Greek alphabet
List of mathematical symbols
Equivalence relation

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