Wodór and other 68,000 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).
The icon is a rounded square, within which is inscribed a letter H about a third as wide as the square. The icon represents atomic hydrogen, the most abundant and basic atomic element in the universe, itself comprised of one proton and one orbital electron.