IPA and unofficial extensions

[David Corbett]

> > What about the strident diacritic in the diacritics table? Is it right
> > to use the tilde below twice (n̰̰ a̰̰) or would a new diacritic (combining
> > double tilde below) be proposed?
> I think the correct encoding is indeed two uses of the tilde below and
> no new character is needed

The strident diacritic is U+1DFD COMBINING ALMOST EQUAL TO BELOW.

L2/07-334R explains:
COMBINING ALMOST EQUAL TO BELOW could possibly be considered COMBINING
TILDE BELOW + COMBINING TILDE BELOW. However, COMBINING ALMOST EQUAL
TO BELOW is one character representing strident vowels. It does not
represent creaky voiced which is what tilde below represents in the
IPA. COMBINING ALMOST EQUAL TO ABOVE exists in Unicode and we believe
the COMBINING ALMOST EQUAL TO BELOW should be added for linguistic
usage as well.