Business Inteligence

  • 銷售
  • 薪資調查
  • 專案

You can change the bell's image for one of the 250 glyphs in font format from the Glyphicon Halflings set.
You just need to change the class "glyphicon-bell" for "glyphicon-YOU-WANT-TO", like "glyphicon-envelope".

See more examples at http://getbootstrap.com/components/.