When the task has been created from Teamwork Desk we will add an icon to that task, the benefit here is that you can choose to view that ticket directly from within your Teamwork Projects account.

The ticket stub icon beside the task denotes that the ticket was created from within Teamwork Desk, hovering over this gives you the ticket details and the option to link to that ticket.

This is also visible from the task details page when viewing the task.