Kannada has a nukta, u+0CBC. But I can’t confirm that nukta is actually used in Kannada. Bright doesn’t mention it in The World’s Writing Systems, Ziegler doesn’t mention it, and neither do the relevant Wikipedia entries. I ran a search on the Parallel Bible Corpus and it doesn’t come up. Is the nukta used with the Kannada script for writing Kannada?
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I know, but I ask here so that the next person who wonders about this can find an answer with a search.
The next mention I find is in CV Srinatha Sastry's 'General Information & Description' of Unicode Kannada (2003). This is discussed initially on page 7, and again on page [10]. Srinatha Sastry notes two foreign phonemes in Kannada that are regularly written with the nukta:
ಜ಼ = Za
In addition to Kannada, ScriptSource identifies ten minority languages that use the script, and it is possible that other letters may carry nukta in the orthographies of these languages. Unfortunately, little information is available regarding these orthographies.ಫ಼ = Fa
Handling the Kannada nukta in fonts is tricky. Providing an anchor for it on base letters is easy enough, but one needs to also handle syllabic ligatures (filtering the nukta so that it doesn't prevent ligature formation, and then anchoring on the appropriate part of the ligature glyph) and presumably accommodate nukta on both base and subsequent consonants in conjunct shaping (although perhaps it would be sufficient to accept explicit virama in such conjuncts and avoid subscripts/postscripts?)
I think that part of the project will have to wait until 2016. Georg will probably have it worked out by then anyway