The tilde (~) is a punctuation mark with many uses. Originally, a letter is used as an abbreviation, but it can also be used as a phonetic symbol or a single word. In mathematics, it is a mathematical symbol representing equivalence. In the final use (especially in lexicography), it is sometimes used as a font size. In a language, phonetic symbols are changes placed on letters. Such as nasalization. In the polyphonic spelling of Greek, tilde is a variant of iambic symbol. It was used as an abbreviation in medieval Latin literature. When "n" or "m" follows a vowel, it is usually ignored, and the tilde is placed above the previous vowel to indicate the ignored vowel. This is why the tilde was used to indicate nasalization. Until 65438+ tilde was used to ignore the vowels of "n" or "m", and it was constantly used to shorten the length of articles in French books. The tilde is occasionally used for other abbreviations, such as the letter "q" to emphasize the word que (that). In Portuguese and some South American dialects (such as Tupi), tilde marks nasal vowels. In addition, Guarani in Tupi is also used. This letter. In Spanish and other culturally influenced languages, such as Galician, Basque and Paraguayan. Is a single letter, indicating a hard nasal sound (IPA [? In Spanish, it was originally written as nn. In Estonia? It is a single letter, representing a single vowel. In Vietnamese, a tilde on a vowel indicates a heavy tone. In the International Phonetic Alphabet, the wavy symbol on the symbol indicates its nasalization, and the wavy symbol on the symbol indicates its soft palate. For example, the French city of Lyon is pronounced as [lj], and in Australian English, the symbol is pronounced as [k? :? ]. Mathematically edit this mathematical symbol, which represents the equivalence relation. Editing this literary symbol is used to express a certain range in daily communication. For example, in short messages, letters or instant chats, A~B is often used to indicate the range from A to B, such as 3, D and so on.