From Longman Dictionary of Contemporary Englishtildetil‧de /ˈtɪldə/ noun [countable] SLAa mark (∼) placed over the letter ‘n’ in Spanish to show that it is pronounced /nj/
Examples from the Corpus
tilde• But last week, the town council unanimously rejected her request to officially add the tilde.Origin tilde (1800-1900) Spanish Medieval Latin titulus “title” 