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From: Heiko Oberdiek <oberdiek@UNI-FREIBURG.DE>
Subject: Unicode for accent \b?
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Hello,

what's the unicode code point for \b as accent?

U+0331 COMBINING MACRON BELOW/NON-SPACING MACRON BELOW
+ opposite of \= (U+0304 COMBINING MACRON/NON-SPACING MACRON)
- Unicode doesn't have a letter with this accent

+U0332 COMBINING LOW LINE/NON-SPACING UNDERSCORE
+ practical use for underlining (e.g. in bookmarks)
- it isn't a typical accent

+U0320 COMBINING MINUS SIGN BELOW/NON-SPACING MINUS SIGN BELOW
- I don't see use cases, especially, there isn't a `plus sign below'.

My guess would be `macron below', \b seems to be inherited
from math mode.

Yours sincerely
  Heiko <oberdiek@uni-freiburg.de>