tilde
/ˈtɪldə/noun
1- an accent (҇) placed over Spanish n when pronounced ny (as in señor) or Portuguese a or o when nasalized (as in São Paulo), or over a vowel in phonetic transcription, indicating nasalization（西班牙语中的）腭化符号（即҇）; （葡萄牙语中的）鼻音化符号（即҇）。
1.1
- a similar symbol used in mathematics and logic to indicate negation, inversion, etc.（数学或逻辑学中的）否定符号（即~）。
词源
mid 19th cent.: from Spanish， based on Latin titulus （see TITLE）.