Definition from Wiktionary, the free dictionary
|Unicode name||MODIFIER LETTER EXTRA-LOW TONE BAR|
|Spacing Modifier Letters||U+02E9|
- When this symbol occurs in combination with other tone letters, they indicate the pitch contour of the tone. For example, ˥˥ means a tone that begins extra-high and ends extra-high and ˨˩˦ means one that begins low, then goes extra-low and ends high.