<a class="btn btn-default" href="#"><i class="fa fa-flag" aria-hidden="true"></i> normal</a><br>
<a class="btn btn-default" href="#"><i class="fa fa-flag fa-rotate-90" aria-hidden="true"></i> fa-rotate-90</a><br>
<a class="btn btn-default" href="#"><i class="fa fa-flag fa-rotate-180" aria-hidden="true"></i> fa-rotate-180</a><br>
<a class="btn btn-default" href="#"><i class="fa fa-flag fa-rotate-270" aria-hidden="true"></i> fa-rotate-270</a><br>
<a class="btn btn-default" href="#"><i class="fa fa-flag fa-flip-horizontal" aria-hidden="true"></i> fa-flip-horizontal</a><br>
<a class="btn btn-default" href="#"><i class="fa fa-flag fa-flip-vertical" aria-hidden="true"></i> fa-flip-vertical</a>
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