Windows 10 Creators update provided a new feature where you can pin up to 3 contacts to our task bar. With the introduction of this feature by default windows has the below icon displayed in the task bar.
Many of my friends requested on how to remove this icon and if you are also interested on how to remove this icon from your task bar, follow the below steps
Open Settings and Click on Personalization
Scroll down and switch the Show Contacts on Taskbar option