Scheduled Checklists
At the start of each morning, your daily view will look quite different than the end of the day. Since most of your stores haven't submitted any checklists yet, a new icon will appear. The 'scheduled' icon means the checklist has not been submitted yet, and it also hasn't passed it's expiry time. In other words, you can think of this icon as in progress or to be completed.
Here's an example: