It was a real pain for me to work with special characters on a web page. Yes we know some of them like " , &" but what happens if we are asked to put ¼ or õ we don't know what is the html name of that character.
This happens frequently when working with languages other than English. So I found a site which has whole a lot of information on that.
Here it is http://ascii.cl/htmlcodes.htm. Here are some of them.
latin small letter a with grave