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~ U+007E, ~ TILDE [unassigned: U+007F–U+009F] ← } [U+007D] Basic Latin   → [U+00A0]

Translingual

Punctuation mark

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1. (Internet slang) Encloses a word or phrase to indicate disdain, mockery, snarkiness, or sarcasm being applied to it.[1]
2. (Internet slang, dated) Encloses a word or phrase to indicate flirtatiousness.[1]

References

1. Jess Kimball Leslie (5 June 2017) , “The Internet Tilde Perfectly Conveys Something We Don’t Have the Words to Explain”, in The Cut‎