Here is a list of ASCII characters I use often enough to create an entry on the blog, but not often enough to remember them off the top of my head.
‘ ‘ Single beginning quotation mark ’ ’ Single ending quotation mark “ “ Double beginning quotation mark ” ” Double ending quotation mark — — Em dash ™ ™ Trade mark ° ° Degree sign ¼ ¼ Fraction one quarter ½ ½ Fraction one half ¾ ¾ Fraction three quarters