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Pitch written as digits.
Also known as: Tone number notation, Chao tone numbers
The convention writing a tone as a sequence of digits giving its start and end levels.
Writes a tone as digits giving its pitch levels, five being highest and one lowest.
Contexts: Language and transcription, Software
The plain-text form of the tone letters, and the reason both exist: the letters are unambiguous on paper and the digits survive a keyboard, so linguists use one for publication and the other for data.
Contexts: Language and transcription, Software
One to three digits from one to five written after a syllable, giving the pitch level at the start, middle and end of the tone.
The digits write the same pitch levels the tone letters draw, in a form that survives plain text.