From: Richard Wordingham (richard.wordingham@ntlworld.com)
Date: Sun Sep 11 2005 - 05:26:20 CDT
Is there any reason for not adding what appears to be a 2-dot visarga to the 
Tamil script?  While, FWIW, I have no evidence that it occurs in Tamil, it 
frequently occurs in Sanskrit and Saurashtra texts written in the Tamil 
scripts.  There are three issues that I can see:
1) It seems that some writers simply use the similar looking colon (U+003A). 
I believe it is regarded as bad practice to use this sort of punctuation as 
a letter.  The 2-dot visarga occurs word-internally in Saurashtra.
2) It might possibly be a glyph variant of aytham.  That seems unlikely - 
has anyone examples of them both appearing, ideally in the same font, in 
text that is a mixture of the Sanskrit and Tamil languages or the Saurashtra 
and Tamil languages?
3) Spoofing and IDN.  ASCII colon and the Tamil-script 2-dot visarga are 
very similar.  However, would a colon be allowed inside a Tamil script name?
The description of the character should probably say something like 
'Sanskrit, Saurashtra, not Tamil'.  I'd prefer something stronger, like 
'Indic languages, not Dravidian', but:
(a) I'm not sure it's actually true.
(b) Many people don't know the use of 'Indic' to refer to a family of 
Indo-European languages, and using it would be as confusing to some as the 
true statement, 'Strine is not an Australian language'.  ('Strine' = English 
as spoken in Australia; 'Australian' = to do with the Australian language 
phylum.)
Richard.
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