≡

≡

1. (mathematics) "Is equivalent to".
2. (mathematics) "Is identically equal to".

   The functions f and g satisfy f≡g if and only if their respective domain of definition coincide, and if f(x)=g(x) for all x in this domain.

3. (mathematics) "Is defined as, is set to".
4. (number theory) "Is congruent to"; used in calculations of modulo.

   15≡3 mod 4, since both 15 and 3 gives a remainder of 3 when divided by 4.

5. (chemistry) A triple bond.
6. (logic, dated) If and only if.
7. (logic) An elementary equivalence.
8. (meteorology) Fog.
9. (computing, dated) ISO 2047 symbol for Line Feed.
10. (botany) A homotypic synonym.

• ≢

• ⩨
• ⧥

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• Appendix:Variations of "≡"
• Appendix:Variations of horizontal lines

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