Unwanted Rainbow icon on pygame

I'm currently working on a pygame script, which is basically displaying an user interface over a webcam stream. This app is running on raspberry pi, on dual screen via fbcp.

I noticed that a strange rainbow square icon did recently appeared in the upper right corner of the screen.

Looking like this, but smaller :

What is it ? How can i remove the display of this icon ?

Thank you !


I found the answer by myself :

This icon is shown by the raspberry itself to inform about under-voltage issue. To prevent it from showing, solve the power issue, or remove rpi warnings (not a safe approach), by adding to /boot/config.txt :


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