Tone letters are letters that represent the tones of a language, most commonly in languages with contour tones. They are used both in language orthographies, such as Hmong, and phonetic transcription, such as the IPA. == Chao tone letters (IPA) == A series of iconic tone letters based on a musical staff was devised by Yuen Ren Chao in the 1920s by adding a reference stave to the existing convention of the International Phonetic Alphabet.
Tone letters are letters that represent the tones of a language, most commonly in languages with contour tones. They are used both in language orthographies, such as Hmong, and phonetic transcription, such as the IPA. == Chao tone letters (IPA) == A series of iconic tone letters based on a musical staff was devised by Yuen Ren Chao in the 1920s by adding a reference stave to the existing convention of the International Phonetic Alphabet.
Source: Wikipedia "Tone letter" · CC BY-SA 4.0
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