Any expression is better expressed with a smiley or emotion rather than normal special symbols. But the smilies are not a part of blogger. To display these wonderful expressions in your blog just add this particular code in your template. It's quite simple and looks good when displayed. I found this in another blog http://technologyhunt.blogspot.com/2008/02/how-to-add-smileys-onto-blogger-posts.html
Either check this blog for the procedure or do it from mine itself.
1) Goto Layout-> Edit HTML
2) Find ]]>, and then paste this code( shown below) under this line.
3) Save the settings.
While writing the posts leave a space before writing the smiley code. It will take some time for the smiley to appear in your blog as it did in mine. :)
Here are some smiley codes:
Have a great time with this :z