Double tilde (~~ or ≈) may refer to:
- Approximation
≈ - Double negation
~(~ - Smart match operator in Perl,
~~ - In PostgreSQL the operator
~~is equivalent toLIKE
- Double binary NOT operator (as used in languages like JavaScript and PHP as a quick way to cast variable as integer, where it is called 'two tildes' to indicate a form of double negation)
- U+0360 ◌◌͠ COMBINING DOUBLE TILDE , a tilde diacritic that spans a pair of adjacent characters: ◌͠◌
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