Tsk tsk. This is the Unicode list. ALL characters are special.
Quite true, except in a some particular context.
Note that I did not use the word "special" in my own explanations.
It appeared only in the quotations I supplied from the OED website.
For an example of valid use of "special" in some particular context, from http://www.unicode.org/mail-arch/unicode-ml/y2002-m11/0575.html:
Would that change the
above quoted non-need for special MORSE DOT and MORSE DASH characters?
Jim Allan
