It is not to be confused with ?̠ COMBINING MINUS SIGN BELOW, ?̲ COMBINING LOW LINE and _ LOW LINE. The difference between "macron below" and "low line" is that the latter results in an unbroken underline when it is run together: compare ac? and a?b?c? (only the latter should look like abc).
Unicode defines several characters for the macron below:
There are many similar marks covered elsewhere:
Various precomposed letters with a macron below are defined in Unicode:
|upper case||lower case||notes|
|?||U+1E06||Ḇ||?||U+1E07||ḇ||Used in the transliteration of Biblical Hebrew into the Roman alphabet to show the fricative value of the letter beth (?). representing [v], or perhaps .|
|?||U+1E0E||Ḏ||?||U+1E0F||ḏ||Used in the transliteration of Biblical Hebrew, Syriac and Arabic into the Roman alphabet to show the fricative value of the letter dalet (?), , and in the romanization of Pashto, it is used sometimes to represent retroflex D.|
|?||U+1E96||ẖ||Sometimes used for Arabic ? ', Hebrew Heth (letter), Egyptian ?.|
|?||U+1E34||Ḵ||?||U+1E35||ḵ||Used in Tlingit and Haida (among other Pacific Northwest languages) for the voiceless uvular stop . Close to Korean ? kk; closest English "shocking"|
|?||U+1E3A||Ḻ||?||U+1E3B||ḻ||One possible transliteration of the Tamil letter ?. ? is used in the Seri language to represent , like English l, while unmodified "l" represents , like Welsh ll. It is also used in the proposed Unified Alphabet for Mapudungun.|
|?||U+1E48||Ṉ||?||U+1E49||ṉ||Used in Pitjantjatjara to represent , and in Saanich to represent both plain and glottalized . In the romanization of Pashto, it is used sometimes to represent retroflex N.|
|?||U+1E5E||Ṟ||?||U+1E5F||ṟ||Used in Pitjantjatjara to represent , and sometimes in the romanization of Pashto to represent the retroflex R.|
|?||U+1E6E||Ṯ||?||U+1E6F||ṯ||Used in the proposed Unified Alphabet for Mapudungun language representing . In the romanization of Pashto, it is used sometimes to represent retroflex T. In the romanization of Arabic this letter is used to transcribe the letter .|
Note that the Unicode character names of precomposed characters whose decompositions contain ?̱ COMBINING MACRON BELOW use "WITH LINE BELOW" rather than "WITH MACRON BELOW". Thus, ḇ LATIN SMALL LETTER B WITH LINE BELOW decomposes to b LATIN SMALL LETTER B and ?̱ COMBINING MACRON BELOW.
Spacing Overscores and Underscores. U+203E OVERLINE is the above-the-line counterpart to U+005F low line. It is a spacing character, not to be confused with U+0305 COMBINING OVERLINE. As with all overscores and underscores, a sequence of these characters should connect in an unbroken line. The overscoring characters also must be distinguished from U+0304 COMBINING MACRON, which does not connect horizontally in this way.