tilde

noun11

1. •
   A diacritical mark ⟨˜⟩ placed above a letter to modify its pronunciation.
2. •
   A symbol ⟨~⟩, with various names and uses, also known as swung dash or wave dash. In the computer industry, various other names may be used, such as squiggle and twiddle.
3. •
   The character encoded as decimal 126 in the 1967 ASCII character set, and later in the 1992 Unicode character set.
4. •
   A punctuation mark that indicates range (from a number to another number). This use is common in Asia, where the symbol in this case is also called a wave dash.
5. •
   In lexicography, the ⟨~⟩ symbol is used used to indicate the repetition of the topical word or item. In this case, the symbol is also called a swung dash.
6. •
   May be used to represent approximation, in English prose and in mathematics. For example, “My dog weighs ~30 pounds.”
7. •
   An alternate form of the logical negation operator, which is usually written as ¬.
8. •
   In Spanish, ⟨ñ⟩ is a palatalized ⟨n⟩, for example in ⟨cañón⟩.
9. •
   In Portuguese, ⟨ã⟩ and ⟨õ⟩ are nasalized vowels, for example in ⟨canção⟩.

   • The tilde was used similarly in Portuguese on vowels to show that the letter bearing the tilde should be pronounced nasally. — 2021
10. •
    The Vietnamese tone mark dấu ngã, which is placed above a vowel to indicate a creaky rising tone (thanh ngã).
11. •
    The apex, a curved diacritic used in the 17th century to mark final nasalization in the early Vietnamese alphabet. It was an adoption of the Portuguese tilde.