Combining macron below
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| A̱a̱Ḇḇ |
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"Combining macron below" ̱ (U+0331) ̱ is a Unicode combining diacritical mark used in various orthographies, see the precomposed characters
Not to be confused are "combining minus below" ̠ (U+0320), "combining low line" ̲̲ (U+0332) and "low line" ("underscore") _ ). The difference between "macron below" and "low line" is that the latter will result in an unbroken underline when run together, compare a̱ḇc̱ vs. a̲b̲c̲.
Note that the Unicode names of composed characters the decomposition of which contains this character misleadingly has "line below" (not "macron below"), thus, ḇ "latin small letter b with line below" decomposes to "latin small letter b" and "combining macron below".
