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Re:Google Noto Fonts by bcoates on Wednesday July 16, 2014 @12:18PM (#8042828)
There are many more glyphs than there are codepoints -- a font contains a ton of information that would be needed to reproduce a script that is not present in unicode tables.
Re:Google Noto Fonts by acdha on Wednesday July 16, 2014 @09:38PM (#8045576)
This is particularly true for non-European languages – ligatures are a minor feature for most of the languages using latin-1 but there are quite a few which depend on complex, multi-letter combinations which are required for text to be comprehensible:

http://en.wikipedia.org/wiki/Complex_text_layout