Unicode discussion platform, Mongolian script

[Philip Taylor]

Fellow TeXxies — is there a platform on which questions relating to 
Unicode may be asked ?
I ask because I have just noticed the following :

> /Grapheme Cluster <http://unicode.org/glossary/#grapheme_cluster>/. 
> The text between grapheme cluster boundaries as specified by Unicode 
> Standard Annex #29, "Unicode Text Segmentation." 
> <http://www.unicode.org/reports/tr29/> (See definition D60 in Section 
> 3.6, Combination 
> <http://www.unicode.org/versions/latest/ch03.pdf#G30602>.) A grapheme 
> cluster represents a horizontally segmentable unit of text

and am wondering why the word "horizontally" is used.  Can there not be 
grapheme clusters
in languages such as Mongolian, written vertically, top-down, L-to-R ?

/Philip Taylor
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