The triple bar, or tribar, written as three parallel horizontal lines, is a symbol with several context-dependent meanings that all indicate the equivalence of two different things, used mainly in mathematics and logic, and it has the appearance of an equals sign with a third line added. The symbol has the Unicode code point U+2261, and a separate Unicode code point, U+2262, represents its negated form, with LaTeX commands available to produce both versions in typeset mathematics.
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Source Triple Bar (Wikipedia)
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1. Triple Bar (Wikipedia)
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The triple bar or tribar, ≡, is a symbol with multiple, context-dependent meanings indicating equivalence of two different things.
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In number theory, it has been used beginning with Carl Friedrich Gauss (who first used it with this meaning in 1801) to mean modular congruence:
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