Description :
Bootstrap is available with 260 glyphicon from glyphicon halflings.Normally glyphicons are not free but in bootstrap these are available free of cost form which some are shown below.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title>Bootstrap Carousel Example</title>
<link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.2/jquery.min.js"></script>
<script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Glyphicon Examples</h2>
<p>
link:
<a href="#"><span class="glyphicon glyphicon-envelope"></span></a>
</p>
<p>
Search:
<button type="button" class="btn btn-default">
<span class="glyphicon glyphicon-search"></span> Search
</button>
</p>
<p>
Search styled button:
<button type="button" class="btn btn-info">
<span class="glyphicon glyphicon-search"></span> Search
</button>
</p>
<p>
Print link button:
<a href="#" class="btn btn-success btn-lg">
<span class="glyphicon glyphicon-print"></span> Print
</a>
</p>
</div>
</body>
</html>