Can also be used to restore other icons
How to Fix Missing Volume/Sound Icon on Taskbar in Windows 10
By default, you should find a volume icon and a number of other system icons in the notification area (i.e., the lower-right corner of the taskbar) of every Windows 10 computer. The volume icon allows you to easily adjust your computer’s output volume, troubleshoot sound issues, and even manage external audio devices.
If the volume or sound icon is missing or you can no longer find it on the taskbar, please refer to the troubleshooting solutions below.
These solutions are not only specific to the volume icon. You can also use them to restore other system icons that are missing from your PC's taskbar.