Double tilde (~~ or ≈) may refer to:

• Approximation ≈
• Double negation ~(~
• Smart match operator in Perl, ~~
• In PostgreSQL the operator ~~ is equivalent to LIKE

• 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)^{[clarification needed]}

• U+0360 ◌◌͠ COMBINING DOUBLE TILDE , a tilde diacritic that spans a pair of adjacent characters: ◌͠◌

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