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Three horizontal bars, asserting equality in every case.
Also known as: Triple bar, Is identically equal to
Three bars assert that two expressions are equal for every value of their variables, not merely for some. The same character is used for congruence in modular arithmetic, and the modulus written afterwards is what tells the two readings apart.
Asserts an identity: the two sides are equal for every admissible value of the variables, rather than for particular solutions.
Contexts: Mathematics
Is also the congruence sign of modular arithmetic, where a modulus is stated afterwards and the claim is equality of remainders.
Contexts: Mathematics
Three short parallel horizontal lines of equal length stacked with even gaps between them.
The same three bars, read as congruence once a modulus follows.