How to Use Accents and Diacritical Marks | Merriam-Webster
Tilde and Tittle. The tilde is the mark ( ˜ ) that is most often seen sitting over the letter 'n' (as in Spanish señor, meaning "sir," and mañana, "tomorrow"), where it indicates a blend of the sound of 'n' and 'y.'. In Portuguese, it may appear over 'a' or 'o,' as in São Paulo, and indicates nasality in pronunciation.
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