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https://bugzilla.redhat.com/show_bug.cgi?id=799565
--- Comment #7 from Shriramana Sharma samjnaa@gmail.com 2012-03-06 01:06:54 EST --- Yes as I told you that is why the character in the Unicode chart has a dotted box around it to indicate that it is a special rendering character.
I quote from: http://www.unicode.org/versions/Unicode6.0.0/ch09.pdf p 310:
Dot Reph. U+0D4E MALAYALAM LETTER DOT REPH is used to represent the dead consonant form of U+0D30 MALAYALAM LETTER RA, when **it is displayed as a dot over the consonant following it**. Conceptually, the dot reph is analogous to the sequence <RA, VIRAMA>, but when followed by another consonant, the Malayalam cluster <RA, VIRAMA, C2> normally assumes the C2 conjoining form. **U+0D4E MALAYALAM LETTER DOT REPH occurs first, in logical order, even though it displays as a dot above the succeeding consonant**. It has the character properties of a letter, and is not considered a combining mark.