iaFont Awesome

<a class="btn btn-danger" href="#">
  <i class="fa fa-trash-o fa-lg"></i> Delete</a>
<a class="btn btn-default btn-sm" href="#">
  <i class="fa fa-cog"></i> Settings</a>

<a class="btn btn-lg btn-success" href="#">
  <i class="fa fa-flag fa-2x pull-left"></i> Font Awesome<br>Version 4.3.0</a>

<div class="btn-group">
  <a class="btn btn-default" href="#"><i class="fa fa-align-left"></i></a>
  <a class="btn btn-default" href="#"><i class="fa fa-align-center"></i></a>
  <a class="btn btn-default" href="#"><i class="fa fa-align-right"></i></a>
  <a class="btn btn-default" href="#"><i class="fa fa-align-justify"></i></a>
</div>

<div class="input-group margin-bottom-sm">
  <span class="input-group-addon"><i class="fa fa-envelope-o fa-fw"></i></span>
  <input class="form-control" type="text" placeholder="Email address">
</div>
<div class="input-group">
  <span class="input-group-addon"><i class="fa fa-key fa-fw"></i></span>
  <input class="form-control" type="password" placeholder="Password">
</div>

<div class="btn-group open">
  <a class="btn btn-primary" href="#"><i class="fa fa-user fa-fw"></i> User</a>
  <a class="btn btn-primary dropdown-toggle" data-toggle="dropdown" href="#">
    <span class="fa fa-caret-down"></span></a>
  <ul class="dropdown-menu">
    <li><a href="#"><i class="fa fa-pencil fa-fw"></i> Edit</a></li>
    <li><a href="#"><i class="fa fa-trash-o fa-fw"></i> Delete</a></li>
    <li><a href="#"><i class="fa fa-ban fa-fw"></i> Ban</a></li>
    <li class="divider"></li>
    <li><a href="#"><i class="i"></i> Make admin</a></li>
  </ul>
</div>