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  • 2006, Jukka K. Korpela, Unicode Explained, page 158:
    Category difference may prevent unification
    The Latin letter retroflex click ǃ (U+01C3) has the same glyph as the exclamation mark in practice (and has also been called Latin letter exclamation mark), but it is used in some African languages to denote a click sound (for example, in the name "ǃkung"). It is therefore classified as a letter, and this is the basic reason for distinguishing it from the exclamation mark.

That's a bit of info I stumbled upon while looking for something else (namely {{knw}}-related citations). - -sche (discuss) 08:07, 14 October 2012 (UTC)