- Red Dot with Rec on Lenovo Legion Y520 Screen: Possible Virus or Recording Issue?

Hello, I have a laptop company lenovo legion y520 and one thing has been puzzling me for some time.
Namely, from time to time (unless twice since I have this laptop) a red dot appeared in the upper left corner with the inscription Rec. I do not know what it means because I have never installed recording programs, etc. Is it possible that it is a virus who records my work on a computer or what is it? After restarting the computer, the dot disappears. Has anyone ever had a similar problem?

To the right of the CTRL key on the left is the record key, it had to be pressed instead of CTRL, therefore the Rec sign appeared.
https://www.notebookcheck.pl/Recenzja-Lenovo-Legion-Y520.224560.0.html

And where do these movies save?

The movies should be located in My Documents / Video / in some subfolder, all programs working on video files save their work in this location.