This page shows the different variations of the Kanał aktywności w 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.
This image depicts three rectangles. Each rectangle has a much longer width than height, resulting in a very compressed image. The three rectangles are stacked horizontally on top of one another, an equal distance from one another.