characters

About

asperand - @
tilde - ~
forward slash,virgule,solidus - /
pilcrow- ¶
obelus - ÷
tittle - A small diacritic mark, such as an accent, vowel mark, or dot over an i.
octothorp, octothorpe, hash mark, pound sign, number sign - #
ogonek - is a diacritic hook placed under the lower right corner of a vowel in the Latin alphabet used in several European and Native American languages.
macron - a diacritical mark (-) placed above a vowel to indicate a long sound
umlaut, diaeresis - a diacritical mark (two dots) placed over a vowel in German to indicate a change in sound
circumflex - a diacritical mark (^) placed above a vowel in some languages to indicate a special phonetic quality
caron, hacek, wedge, inverted circumflex inverted hat - a diacritical mark (ˇ)
cedilla - a diacritical mark (,) placed below the letter c to indicate that it is pronounced as an s
serif, ceriph, seriph - A fine line finishing off the main strokes of a letter, as at the top and bottom of M.

others:
http://wordie.org/lists/a-little-carrot-over-the-a
http://wordie.org/tags/who%20knew
http://wordie.org/lists/it-has-a-name
http://en.wikipedia.org/wiki/Diacritic
http://wordie.org/lists/quite-a-character