//TrackerMembersBundle:Macros:bootstrap.html.twig
{% macro icon_class( type ) %}
{% set type_class_map = {
    likePoints: 'icon-user'
  } %}
{{ type_class_map[type] }}
{% endmacro %}

//TrackerMembersBundle:_browsesnippet.html.twig
{% import "TrackerMembersBundle:Macros:bootstrap.html.twig" as bootstrap %}

 {% set heading = pagination.sortable('likePoints', 'likePoints') %}
 <th class="{{ bootstrap.icon_class(heading) }}">{{ heading }}</th>