Font Awesome
             

fa-star-half-o · Unicode: f123 · Created: v3.1 · Categories: Web Application Icons · Aliases: fa-star-half-empty, fa-star-half-full

After you get up and running, you can place Font Awesome icons just about anywhere with the <i> tag:

fa-star-half-o 
<i class="fa fa-star-half-o"></i> fa-star-half-o

Looking for more? Check out the examples.