the mark ( ˜ ) placed over letters in some languages and some vowels in the International Phonetic Alphabet to show how they should be pronounced, as in España, São Paulo and /pɒ̃ʃɒ̃/ (penchant) 腭化符号（~）（置于某些语言的字母和国际音标中某些元音符号之上，表示发音方法） - (also swung dash)
the mark ( ˜ ), used in some dictionaries to represent the headword of an entry 波浪号，代字号（在本词典词条的某些地方用以代表首词）
Word Originmid 19th cent.: from Spanish, based on Latin titulus ‘inscription, title’.