This page shows the different variations of the Klatka ładowania 5 from an Icons8 icon pack. Feel free to resize and recolor the icon, and then download the icon in PNG format for free. Icons are available in PNG and vector.
The image is a circle made of circles. The circles vary in size. Starting from the bottom left is the smallest circle that looks like a dot. Going clockwise, the circles get bigger until the biggest one is right next to the dot at the bottom.