Kąpiel and other 85,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
This can be described as a large alphabet U whose edges have a small curve pointed towards outside on both edges and have small rectangular bar placed on top of it whose length is exactly equal to the width of the alphabet U. Also there are two small curved lines underneath the alphabet U with right one bend towards east or right and left one bend towards west or left.