Examples

    <%= icon 'copyright-mark' %>
    %= icon 'sort-by-attributes-alt'

    <span class="glyphicon glyphicon-copyright-mark"></span>
    <span class="glyphicon glyphicon-sort-by-attributes-alt"></span>

    <%= icon 'copyright-mark' %>

    <span class="glyphicon glyphicon-copyright-mark"></span>

    %= icon 'sort-by-attributes-alt'

    <span class="glyphicon glyphicon-sort-by-attributes-alt"></span>