If you're just getting started with FullStory, you may not be familiar with some of the visuals you'll see when watching sessions. Here's a high level view of what these icons represent. Additionally, if you see an icon or event appearing in pink when viewing a specific session, this simply means that this particular event matched your current search segment.
Playback Timeline Key
These visuals appear in your playback timeline at the bottom of your screen.
Event Timeline Key
These visuals appear in your event timeline on the right of your screen.