The character to which Dave is referring might be this one.
U+0123 LATIN SMALL LETTER G WITH CEDILLA
However, it is not a cedilla it is a comma. The Postscript name is gcommaaccent.
The Unicode code chart has an example of how one may deal with the possible conflict of a comma below with the tail of a lowercase g.
The document states “there are three major glyph variants”.
The character is used in the Latvian language. I do not know the Latvian language yet I have supported it in some of my fonts, as I mention in the following thread.
William Overington
21 February 2008