Niesłyszący 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).
It is a human ear with the person's head not visible with a diagonal line across it. It can symbolize a lack of audio or auditory ability. There is no circle around the ear and the line cuts it in half.