Tone letter

Rising and falling tones^[1]
Rising and falling tones
˩˥ ˧˥ ˨˦ ˩˧ ˩˩˧; ˥˩ ˥˧ ˦˨ ˧˩ ˥˥˧

Level tones
Level tones
˥ ˧ ˩; ˥ ˩
	Long level-tone letters are commonly used for non-checked syllables and short letters for checked syllables, though this is not an IPA distinction.

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Peaking and dipping tones^[1]
˩˥˧ ˧˥˩ ˧˥˧ ˩˧˩ ˥˩˧ ˧˩˥ ˥˧˥ ˧˩˧ ˨˦˨ ˦˨˦ ˨˩˧꜔꜓꜕
Contour-tone letters are composed as sequences: ˥ ˧ → ˥˧, ˧ ˩ ˧ → ˧˩˧

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Tone letters are letters that represent the tones of a language, most commonly in languages with contour tones.

^ ^a ^b A great deal more combinations than these are possible. These examples are only slightly expanded from the limited set of ligatures suggested by Chao for broad phonetic notation, where mid-high and mid-low tones combine only with each other, and level does not combine with rising or falling.