Yeah you can click it and see what happens, that is what I do when I am on new system. Maybe my grandparents would be scared of clicking some icons. Current new users are kids which are less scared of clicking around and getting to know what this thing does.

Icon can help later in quickly locating this program, but I do not really care what it is. Does firefox, chrome icon or internet explorer show you that it will display websites? Internet explorer icon became "Internet" icon for a lot non technical users I think.