It can mean "similar to", including "of the same order of magnitude as", such as "x ~ y" meaning that x and y are of the same order of magnitude. This symbol (in English) sometimes means "approximately", such as "~30 minutes ago" meaning "approximately 30 minutes ago".
Especially in lexicography the tilde as a separate character or swung dash ( ⁓) is used in dictionaries to indicate the omission of the entry word.
And there are additional similar characters for different roles. These are encoded in Unicode at U+0303 ◌̃ combining tilde and U+007E ~ tilde (as a spacing character). It was originally written over a letter as a mark of abbreviation, but has since acquired a number of other uses as a diacritic mark or a character in its own right.
The name of the character comes from Portuguese and Spanish, from the Latin titulus meaning "title" or "superscription", though the term "tilde" has evolved and now has a different meaning in linguistics. The tilde ( / ˈ t ɪ l d ə /, / ˈ t ɪ l d i / ˜ or ~ ) is a grapheme with several uses.
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