This icon is Chrome's built-in tab search feature ... By toggling this feature on, every time you open Chrome, the browser will automatically reopen the tabs you had open in your previous session. To ...

To check, click the hamburger icon at the upper right ... you can change the name or color, add a new tab to the group, move the group to a new browser window, save and close the group, ungroup ...

This icon is Chrome's built-in tab search ... By toggling this feature on, every time you open Chrome, the browser will automatically reopen the tabs you had open in your previous session.